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  • 101
    Electronic Resource
    Electronic Resource
    The structure of the organ of bellonci of the syncarid crustacean, Anaspides tasmaniae (Thomson) (1972)
    Springer
    Cell & tissue research 132 (1972), S. 431-450 
    Details
    ISSN: 1432-0878
    Keywords: Organ of bellonci (Anaspides tasmaniae) ; Crustacea ; SPX organ ; Receptor ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The organ of Bellonci of Anaspides tasmaniae (Thomson) (Crustacea, Syncarida) is described light and electron microscopically, and a few histochemical tests are reported. Located ventrally in the eyestalk below the medulla interna, the organ is composed of a number of cavities. These are similar in structure in their contents and associated cellular components, which include two types of glia cells delimiting each cavity and the terminal parts of a few dendrites. Each dendrite usually bears two cilia, which project into the cavity where they split up into numerous branches. The organ is supplied by three nerve tracts: two from the medulla terminalis and one from the medulla interna. The sensory pore, which is innervated from the medulla interna, is not closely associated with the organ of Bellonci in Anaspides. No marked secretory activity is detectable by histochemical or ultrastructural observations. It is thought that the organ has a sensory function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306635
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  • 102
    Electronic Resource
    Electronic Resource
    The eyes of Creophilus erythrocephalus F. and Sartallus signatus sharp (Staphylinidae: Coleoptera) (1972)
    Springer
    Cell & tissue research 133 (1972), S. 59-86 
    Details
    ISSN: 1432-0878
    Keywords: Compound eyes ; Coleoptera ; Ultrastructure ; Dark-light-adaptation ; Irregularities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The structures of the eyes of two Staphylinid beetles, one large (Creophilus erythrocephalus—18 mm in length) and one small (Sartallus signatus—3 mm in length), were compared. 1. The gross structure of the two eyes is the same: a) biconvex corneal lens, b) crystalline cone of “acone type”, c) narrow crystalline thread and thickening of cone cell extensions just above the rhabdom, d) seven retinula cells plus one basal cell, and e) almost the same corneal refractive index and optical properties of the corneal cuticle. Considerable differences exist in size, shape and arrangement of rhabdom, retinula cells and their axons. The smaller size of the eye of Sartallus is caused by reduction of number of facets rather than cell size, and, in fact, retinula cells and rhabdom have been found to be larger in the smaller beetle. 2. Structural changes during dark-light-adaptation affect crystalline cone, position of screening pigment and size of intercellular spaces between the retinula cells. In the dark-adapted state the cone retracts a little and the crystalline tract becomes wider. A thickening of cone cell extensions occurs just above the rhabdom. Screening pigment migrates to a more distal position and intercellular spaces between the retinula cells considerably increase in size as compared with the light-adapted eye. 3. Both eyes are rich in irregularities. An attempt to classify anomalies of compound eyes has been made. The number of cone cells and principal pigment cells varied, in some cases, from 1–5 and 0–3 respectively. Basal retinula cells did not always contribute to the rhabdom. 4. Interferometrical observations reveal the extreme optical homogeneity of the entire corneal cuticle of the eyes of both species. No layers of different refractive index or optical separation of adjacent ommatidia can be found. The refractive index of the cornea of Creophilus is 1.469; that of Sartallus is 1.488. 5. Functional consequences of the changes which occur during dark-light-adaptation are discussed. Exposure to intense light appears to cause a rapid aging of retinula cells, which is indicated by an increase of onion- and multivesicular bodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307068
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  • 103
    Electronic Resource
    Electronic Resource
    Die Ultrastruktur des Gabeschen Organs von Schizophyllum sabulosum L. (Diplopoda, Iuliformia) (1972)
    Springer
    Cell & tissue research 132 (1972), S. 273-285 
    Details
    ISSN: 1432-0878
    Keywords: Diplopoda ; Organ of Gabe ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung 1. Das Gabesche Organ von Schizophyllum sabulosum ist paarig und liegt im seitlichen Clypeolabrum. Es wird von Axonen des Nervus labri medialis erreicht, der vorher Seitenzweige abgegeben hat. 2. Die Axone gehören neurosekretorischen Zellen des Protocerebrum an und enthalten Neurosekret. Die Elementargranula sind recht gleichmäßig ellipsoid, der große Durchmesser beträgt ca. 1200 Å. Die Axone enden im Organ und stellen dessen extrinsische Komponente dar. 3. Außerdem gibt es zwei intrinsische Zelltypen: 1) Drüsenparenchymzellen mit axonartigen Fortsätzen und 2) gliaartige Zellen. Die Parenchymzellen bilden Sekret in Form opaker Vakuolen, die deutlich größer als die Neurosekretgranula sind. Auffällig ist das überwiegend vesikuläre endoplasmatische Reticulum. Die Mitochondrien liegen in der Nähe von myelinähnlichen Körpern; ihre Außenmembran ist stellenweise vakuolig vorgewölbt. Die axonartigen Fortsätze enthalten viele längsorientierte Mikrotubuli. 4. Die langen Fortsätze der gliaartigen Zellen umhüllen die Parenchymzellen und die extrinsischen Axone meist in mehreren Schichten. Es gibt aber auch Bereiche, in denen vor allem die Fortsätze der Parenchymzellen und die extrinsischen Axone nackt sind. 5. Das Organ ist gegen das umgebende Hämocoel von einer dicken, lamellierten Stromahülle abgegrenzt. Auch Interzellularräume sind mit Stroma gefüllt. 6. Das Organ wird mit der Cerebraldrüse einiger Chilopoden und gewissen endokrinen Organen anderer Diplopoden und Insekten verglichen.
    Notes: Summary 1. The paired organ of Gabe of Schizophyllum sabulosum is situated in the lateral clypeolabrum. It is innervated by axons of the medial labral nerve, which divides in several branches before reaching the organ. 2. Axons extend from neurosecretory cells of the protocerebrum and contain neurosecretory droplets, which are almost ellipsoid and about 1,200 Å in diameter. The axons terminate in the organ and constitute its extrinsic elements. 3. In addition, there are two types of intrinsic cells: (1) parenchyma cells with axon-like processes and (2) glia-like cells. The parenchyma cells produce secretory material in the form of opaque vacuoles, which are clearly larger than the neurosecretory granules. The preponderantly vesicular endoplasmic reticulum is conspicuous. Also characteristic are the mitochondria, whose superficial membranes are expanded locally, and which lie in the near vicinity of myeline-like bodies. The axon-like processes contain many microtubuli oriented in longitudinal direction. 4. The slender processes of the glia-like cells envelop both parenchyma cells and extrinsic axons usually in several layers; but there are also regions in which the processes of the parenchyma cells and, above all, the extrinsic axons are naked. 5. The organ is delimited from the surrounding hemocoele by a thick laminated stroma. Intercellular spaces are also filled with stroma. 6. The organ is compared with the cerebral gland of some chilopods and with certain endocrine organs of other diplopods and insects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307017
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  • 104
    Electronic Resource
    Electronic Resource
    An ultrastructural study of the body wall muscles of the pentastomid Reighardia sternae dies. 1864 parasitic on the herring gull Larus argentatus pontopp (1972)
    Springer
    Cell & tissue research 130 (1972), S. 12-17 
    Details
    ISSN: 1432-0878
    Keywords: Muscle tissue ; Pentastomid ; Body wall ; Parasite ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the body wall muscle of the pentastomid Reighardia sternae is described. The muscle fibres are separated from one another and form two layers, circular and longitudinal. They are cross-striated with approximately 11 actin filaments surrounding each myosin filament. The T-system consists of simple in-pushings of the sarcolemma. The SR is also simple and forms both dyadic and triadic contacts with the T-system tubules and dyadic contacts with the sarcolemma. Electron-dense inclusions occur, usually in the vicinity of the Z-lines, and it is suggested that these may be composed of unsaturated lipids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306991
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  • 105
    Electronic Resource
    Electronic Resource
    Ultrastructure de l'endomètre humain normal (1972)
    Springer
    Cell & tissue research 133 (1972), S. 47-57 
    Details
    ISSN: 1432-0878
    Keywords: Endometrium ; Human ; Granular stroma cells ; Relaxin ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'ultrastructure générale des cellules K endométriales est semblable chez l'Homme, le Rat et le Singe. Mais les granulations des cellules K humaines sont plus variées que dans ces deux dernières espèces et ont certains aspects suggérant une fonction catabolique. Etant donné cet aspect catabolique et l'existence connue d'une activité phosphatasique acide de ces cellules contenant de la relaxine, les auteurs suggèrent que les cellules K pourraient être des cellules sécrétantes en involution et ques les cellules sécrétant activement la relaxine pourraient avoir un aspect morphologique quelque peu différent de celui des cellules K.
    Notes: Summary The general ultrastructure of endometrial granular stroma cells is similar in man, rat, and monkey. But the granulations of human granular stroma cells are more various than in these two last species and have some aspects suggesting a catabolic function. With respect to this catabolic aspect and the previously shown acid-phosphatase activity of these relaxin-containing cells the authors suggest that the granular stroma cells could be involutive secretory cells and that the active relaxin-secretory cells may have some different morphological aspect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307067
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  • 106
    Electronic Resource
    Electronic Resource
    Zur Morphologie des Ovars von Viviparus contectus (Millet 1813), (Gastropoda, Prosobranchia) (1972)
    Springer
    Cell & tissue research 133 (1972), S. 103-118 
    Details
    ISSN: 1432-0878
    Keywords: Ovary ; Gastropoda ; Follicle cells ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Das Ovar von Viviparus contectus besteht, wie licht- und elektronenmikroskopische Untersuchungen ergeben, aus einem langen, terminal verzweigten dünnen Schlauch, dessen Wand von einem Epithel aus Oocyten in allen Entwicklungsstadien und Follikelzellen gebildet wird. Das Vorkommen von Oogonien in den Ovarien adulter Weibchen ist zweifelhaft. Die Follikelzellen sind als Begleitzellen der Oocyten im allgemeinen extrem langgestreckt. Mit ihrer Basis sitzen sie einer dünnen Basalmembran fibrillärer Struktur auf, wie sie bisher nur für Mollusken beschrieben wurde. Die Follikelzellen enthalten große Mengen von Vesikeln, einen bemerkenswert gut ausgebildeten Golgi-Apparat, spärliches rauhes endoplasmatisches Retikulum und zahlreiche heterogene cytosomale Einschlüsse. Charakteristisch für die Zellen sind außerdem in der Längsrichtung liegende cytoplasmatische Mikrotubuli und vereinzelte Kinetosomen. Obwohl keine direkten morphologischen Beziehungen zwischen Follikelzellen und Oocyten festgestellt werden konnten, wird vermutet, daß die Follikelzellen Material degenerierender Oocyten aus dem Lumen des Ovars resorbieren und speichern. Dieses kann den heranwachsenden Oocyten zugute kommen.
    Notes: Summary The ovary of Viviparus contectus was studied light and electron microscopically. It consists of an extended and terminally branched duct, its wall being formed by oocytes of all stages and by follicle cells. The existence of oogonia in the adult females cannot be established with certainty. According to their relationship to the growing oocytes the follicle cells are in general extremely elongated. At the basis they are attached to a thin basement lamina having a fibrillar structure hitherto only known in molluscs. The follicle cells contain many vesicles, a remarkably well-developed golgi apparatus, some rough endoplasmic reticulum, and many heterogeneous cytosomes. Characteristic for these cells are also cytoplasmic microtubules oriented longitudinally along the cell axis. Kinetosomes can rarely be seen. Although there are no apparent direct interrelationships between follicle cells and oocytes, it is suggested that they are engaged in resorbing material of degenerating oocytes from the lumen of the ovary and in storing materials which may be used by the growing oocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307070
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  • 107
    Electronic Resource
    Electronic Resource
    The ultrastructure of neuromuscular systems in Notoplana acticola, a free-living polyclad flatworm (1972)
    Springer
    Cell & tissue research 133 (1972), S. 277-288 
    Details
    ISSN: 1432-0878
    Keywords: Flatworm ; Muscle ; Neuromuscular junction ; Sarcoplasm ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Neuromuscular junctions in the marine polyclad flatworm, Notoplana acticola were studied with the electron microscope. Synapses were found between nerve endings and specialized extensions of the muscle cells. Characteristically these processes contained clear cytoplasm with a basal mitochondrion and numerous microtubules aligned parallel to the long axis of the extension. Sarcoplasmic diverticuli which contained the nucleus had granular cytoplasm with an assortment of membranes and organelles. We have proposed the term sarconeural junction to describe synapses between long sarcoplasmic extensions and nerve cells in flatworms as well as other animals. Tight junctions between adjacent contractile portions of muscle cells were common. As groups of cells appeared to be connected by tight junctions or shared common nerve terminals we conjectured that these formed discrete functional motor-units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307148
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  • 108
    Electronic Resource
    Electronic Resource
    Ultrastruktur und Jodaufnahme der Schilddrüse bei Larven des Krallenfrosches (Xenopus laevis Daud.) (1972)
    Springer
    Cell & tissue research 130 (1972), S. 553-574 
    Details
    ISSN: 1432-0878
    Keywords: Thyroid gland ; Xenopus laevis ; Iodine uptake ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Ziel dieser Untersuchung war eine physiologische Deutung der Ultrastruktur von Schilddrüsenepithelzellen bei Larven von Xenopus laevis. Dazu wurden elektronenmikroskopische Bilder mit morphometrischen Methoden quantitativ ausgewertet und die Ergebnisse mit Jodaufnahmedaten verglichen. So konnte die Aktivierung der Schilddrüse durch TSH bei kälteblockierten bzw. hypophysektomierten Tieren mit Veränderungen während der spontanen Metamorphose verglichen werden. Ihrer Ultrastruktur nach sind die Schilddrüsen blockierter Prometamorphoselarven in der Entwicklung auf ein früheres Stadium zurückversetzt. Auch zeigen hypophysektomierte Larven keine spontane Jodaufnahme. Eine einmalige TSH-Injektion läßt dann die Größe und Form der verschiedenen Organellen vorübergehend den Zustand der Kontrollen erreichen. Besonders rasch und stark sprechen einerseits die Kernstruktur, andererseits Mikrovilli und Kolloidtropfenvolumen, welche die Resorption von Thyreoglobulin charakterisieren, auf den TSH-Reiz an. Die Jodaufnahme verläuft langsamer. Auch reagieren die an der Synthese beteiligten Organellen später und schwächer. In der spontanen Metamorphose wachsen die Schilddrüsen, nach Totalvolumen, Cytoplasmavolumen einzelner Zellen und Epithelhöhe beurteilt, bis zum Ende der Metamorphose weiter und nehmen entsprechend mehr Jod auf. Ebenso wird während der ganzen Klimax die Kolloidresorption der einzelnen Zellen stärker. Aus den Ergebnissen wird geschlossen, daß die TSH-Sekretion schon in der Prometamorphose einsetzt und bis gegen Ende der Metamorphose zunimmt.
    Notes: Summary The epithelial cells of the thyroid gland in larvae of Xenopus laevis were investigated with the electron microscope. Morphometrical methods yielded quantitative data on the morphology. The uptake of radioactive iodine was studied in order to obtain information on the physiological activity. Thus changes in the thyroid gland following the injection of TSH in tadpoles which had been hypophysectomized or blocked at low temperature were compared with the development of glands during spontaneous metamorphosis. The thyroid glands of blocked prometamorphic larvae resemble those of younger developmental stages as judged by their ultrastructure. In addition no spontaneous accumulation of iodine is observed. Following an injection of TSH the morphology of the various organelles becomes temporarily identical to that of the controls. These changes are most prominent in the nucleus as well as in the microvilli and the colloid droplets, which characterize the resorption of thyroglobulin. Only a minor effect of the TSH stimulus is found on iodine uptake and on organelles concerned with protein synthesis. During normal metamorphosis an increase is observed in the following parameters: (1) volume of the thyroid gland, (2) volume of the cytoplasm and height of single epithelial cells, (3) resorption of colloid, (4) iodine uptake. This increase persists until the end of the climax. Based on the present results TSH secretion is assumed to start in early prometamorphosis and to rise up to the end of metamorphosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307007
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  • 109
    Electronic Resource
    Electronic Resource
    Zur Morphologie und Funktion der Calcitoninzellen (C-Zellen) der Ratte (1972)
    Springer
    Cell & tissue research 134 (1972), S. 13-30 
    Details
    ISSN: 1432-0878
    Keywords: Rat ; Thyroid C-cells ; Ultrastructure ; Tocopherol and Ubiquinone deficiency ; Substitution (d,1-α-Tocopherol, α-Tocopherolquinone)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung An der Schilddrüse von Wistar-Ratten wurde der Einfluß der Kost (Laborstandardkost, halbsynthetische-tocopherolhaltige und halbsynthetische-tocopherol-freie Kost) und der subkutanen Injektion von Tocopherol und Tocopherolchinon auf die Ultrastruktur der C-Zellen untersucht. Während nach Standardfütterung die Aktivität der C-Zellen der Norm entspricht, werden Syntheseleistung und Sekretabgabe dieser Zellelemente durch die halbsynthetische-tocopherolhaltige Kost gesteigert und im alimentären Tocopherol-Ubichinonmangel wieder gedämpft. Der elektronenmikroskopisch erkennbare Gehalt der C-Zellen an Sekretgranula entspricht der in vitro ermittelten Calcitoninaktivität. Die Beziehungen zwischen den Funktionskreisen von Thyreozyten und Calcitoninzellen werden diskutiert.
    Notes: Summary The influence of different diets (standard laboratory diet, semisynthetic tocopherol-containing and semisynthetic tocopherol-free diet) and the influence of subcutaneous injections of tocopherol and tocopherolquinone upon the ultrastructure of the C-cells in the thyroid gland of Wistar rats were investigated. While the activity of the C-cells is quite normal after feeding a standard diet, the synthetic and secretory activities of these cells show an increase with a semisynthetic diet containing tocopherol, but a decrease during alimentary lack of tocopherol and tocopherolquinone. The amount of secretory granules in the C-cells as seen with the electron microscope corresponds with the in vitro-activity of extracted calcitonin. The relations between the functional system of the thyrocytes and that of the C-cells are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307233
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  • 110
    Electronic Resource
    Electronic Resource
    The ultrastructure of the A1 sensilla on the posterior surface of the clypeo-labrum of Locusta migratoria migratorioides (R and F) (1972)
    Springer
    Cell & tissue research 134 (1972), S. 539-554 
    Details
    ISSN: 1432-0878
    Keywords: Chemoreceptors ; Locusta ; Clypeo-labrum ; Light and electron microscopy ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The A1 sensilla are asymmetric in distribution. Each sensillum contains five bipolar neurons, the distal regions of which extend to the tip of a cuticular cone which has a terminal pore. This was shown with the scanning electron microscope, but was not seen in section. The receptor-lymph cavity of the tormogen cell and the basal cavity of the neurilemma cell contain an electron-dense material unlike other contact chemoreceptors of Locusta prepared for electron microscopy in the same manner. Isolated axons of unknown function occur below the basement membrane and also between epidermal cells surrounding the sensillum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307673
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  • 111
    Electronic Resource
    Electronic Resource
    Ultrastructure of the anuran pars intermedia following severance of hypothalamic connection (1972)
    Springer
    Cell & tissue research 131 (1972), S. 545-557 
    Details
    ISSN: 1432-0878
    Keywords: Pars intermedia ; Hypothalamus ; Anurans ; Hormone release ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the pars intermedia of Rana catesbeiana tadpoles was studied following isolation from the hypothalamus, in vivo after sectioning of the pituitary stalk, and in vitro after implantation of the pituitary into a piece of tail fin. Both experimental procedures were followed by rapid and sustained skin darkening. Pituitaries from normal light and dark adapted tadpoles served as controls. In 4-hour disinhibited glands, melanotrophs revealed hyperactive Golgi bodies, colloid vesicles (1–2 microns) in close proximity to axon terminals, and no apparent loss of secretory granules. At 24 hours extracellular colloid adjacent to axon terminals was found, and extensive arrays of RER appeared in the melanotrophs. Obvious granule loss from secretory cells occurred within a week, by which time the cytoplasm was occupied by large cisterns of SER and RER and abundant free ribosomes. Dense core vesicles (600–900 Å) in aminergic nerve terminals disappeared shortly after isolation of the pituitary from the hypothalamus, and only decreasing numbers of translucent vesicles (200–300 Å) were found. The functional significance of these changes is discussed, with particular emphasis on the mode of acute hormone release.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306970
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  • 112
    Electronic Resource
    Electronic Resource
    Oligodendrocytes in the normal and chronically de-afferented lateral geniculate body of the monkey (1972)
    Springer
    Cell & tissue research 135 (1972), S. 115-127 
    Details
    ISSN: 1432-0878
    Keywords: Oligodendroglia ; Monkey ; De-afferentation ; Ultrastructure ; Densebodies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electron microscopical examination of the norma and de-afferented ‘laterall geniculate body’ of the monkey following paraformaldehyde-glutaraldehyde vascular perfusion revealed distinctive morphological features of different types of oligodendrocyte. These cells were normally situated as perineuronal satellites or in relation to axons and capillaries. A wide range of nuclear and cytoplasmic densities were displayed by both satellite and interfascicular oligodendrocytes. The following distinctive features for the identification of ligodendrocytes were utilised: the presence of large quantities of free ribosomes and ribosomal rosettes, microtubular profiles, dense marginal aggregation of nuclear chromatin together with light patches and numerous nuclear pores; but the absence of broad cytoplasmic processes, glycogen and gliofibrils. Circumferential perinuclear organization of the cytoplasmic organelles was typical of oligodendrocytes. Particular attention was paid to perineuronal satellite cells in view of the known transneuronal atrophy in the de-afferented geniculate body. Some cells having a nuclear pattern of oligodendrocytes but showing hyalinisation of perikaryon were seen in de-afferented laminae. A notable feature was the presence of variegated “osmiophilic bodies” in the perikaryon of oligodendrocytes also situated in the de-afferented laminae. A cell type combining the features of oligodendrocytes and astrocytes was classified as ‘intermediate neuroglia’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307092
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  • 113
    Electronic Resource
    Electronic Resource
    Les cellules corticotropes de l'hypophyse d'un Amphibien après interrénalectomie (1972)
    Springer
    Cell & tissue research 132 (1972), S. 333-364 
    Details
    ISSN: 1432-0878
    Keywords: Pituitary gland ; Amphibians ; Corticotrophs ; Ultrastructure ; Immunocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'identification des cellules responsables de l'élaboration de la corticotropine (ACTH) a été envisagée chezRana esculenta. Les effects causés par l'interrénalectomie au niveau de l'hypophyse ont été étudiés parallèlement par immunofluorescence et au microscope électronique. Au microscope à fluorescence, les cellules détectées chez les animaux témoins avec un antisérum anti-synachten1 bordent en grand nombre les capillaires des zones médiorostrale et ventrale du lobe antérieur. Deux jours après interrénalectomie, le nombre de cellules fluorescentes décroît, douze jours après l'intervention, il ne subsiste pas d'éléments fluorescents dans cette zone. Au microscope électronique, les cellules corticotropes présentent de fines granulations d'environ 200 mμ de diamètre. Après interrénalectomie bilatérale, ces cellules sont fortement stimulées, elles sont sujettes à d'importantes modifications morphologiques; l'aspect morphologique des autres catégories de cellules antéhypophysaires, par contre, n'est pratiquement pas modifié. Douze jours après l'opération, la plupart de ces cellules sont dégranulées, l'ergastoplasme et l'appareil de Golgi sont bien développés. Ces observations suggèrent que les cellules péricapillaires de la moitié rostrale de lapars distalis sécrètent l'hormone corticotrope.
    Notes: Summary Identification of the cell types responsible for the production of adrenocorticotropin (ACTH) was performed inRana esculenta. The effects of interrenalectomy on the pituitary cells were studied as well by immunofluorescence, as by electron microscopy. In control animals, the ACTH cells studied by immunofluorescence are numerous around the blood vessels of the medio-rostral and medio-ventral part of the anterior lobe. Two days after interrenalectomy the number of fluorescent cells decreases. Twelve days after, the operation all the fluorescent cells disappeared. The fine structure of the corticotrophs is characterized by the presence of small secretory granules (200 mμ). After bilateral interrenalectomy this cell type is markedly stimulated; it displays striking morphological changes, while the morphology of the other pituitary cell types is not considerably modified. Twelve days after operation most of these cells are degranulated, the rough endoplasmic reticulum and the Golgi apparatus are well developed. These findings suggest that the pericapillary cells of the rostral half of thepars distalis produce the adrenocorticotrophic hormone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450713
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  • 114
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    Ultrastruktur des Pseudoculus vonEosentomon (Protura, Insecta) (1972)
    Springer
    Cell & tissue research 135 (1972), S. 539-551 
    Details
    ISSN: 1432-0878
    Keywords: Pseudoculus ; Eosentomon (Protura, Insecta) ; Sense organ ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung In der Feinstruktur unterscheidet sich der Pseudoculus vonEosentomon nicht wesentlich von dem der Acerentomiden. Durch einen Endokutikulaporus treten die dendritischen Fortsätze zweier Sinneszellen, jeweils umgeben von einer Hüllzelle, in den Außenraum des Pseudoculus ein. Der Außenraum wird nach distal von einer äußeren Kutikulaschicht — vermutlich Epikutikula — abgeschlossen. Sie vermittelt durch regelmäßig angeordnete lange Spalten die Verbindung zur Außenwelt. Am Grunde der Spalten finden sich Porentubuli, die mit den Hüllzellen oder den distalen Fortsätzen der Dendriten Kontakt haben können. Aus der Feinstruktur kann geschlossen werden, daß der Pseudoculus als Chemo-, Hygro- und/oder Thermorezeptor fungiert.
    Notes: Summary Concerning its fine structure the pseudoculus of Eosentomon is quite similar to that of Acerentomide Protura. There are two sensory cells innervating the organ. From each of them one dendritic process derives, surrounded by one enveloping cell. The processes of these four cells enter the distal cavity of the pseudoculus through a pore in the endocuticular layer. The cuticular layer of the cap seems to consist of epicuticle only. It is furrowed by long clefts connecting the distal cavity of the organ with the outside. Poretubules insert at the base of the clefts and may have contact with the cell membranes of both enveloping cells and dendritic processes. According to its structure the pseudoculus may function as chemo-, hygro- and/or thermoreceptor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00583435
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  • 115
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    Nervous system of the snailHelix aspersa (1972)
    Springer
    Cell & tissue research 135 (1972), S. 473-482 
    Details
    ISSN: 1432-0878
    Keywords: Neurosecretory nerves ; Glial and pigment cells ; Neural sheath ; Gastropods ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of neurosecretory nerves and endings associated with the sheath of the infraesophageal ganglion ofHelix aspersa is described. The sheath is a neurohemal organ whose vascularized stroma receives both monoaminergic and peptidergic endings. The latter occur along the surface of the nerves or scattered within the stroma. They include a complex population of vesicular profiles. The granular vesicles (1300–3000 Å in diameter) exhibit structural modifications that may be related to the intra-axonal release of their neurohormones. The agranular vesicles (500–2000 Å in diameter) occur in large numbers and lie mostly adjacent to the axon surface. Synaptoid specializations seem to represent active sites for the extracellular discharge of neurosecretory material. The monoaminergic endings so far studied lack synaptoid specializations and contain small granular (800–1300 Å in diameter) and agranular (700 Å in diameter) vesicles. Two kinds of non-neural cells are associated with the nerves: glial cells and melanocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00583431
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