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  • 1
    Electronic Resource
    Electronic Resource
    Embryology of X Organs in Crangon allmanni (1957)
    [s.l.] : Nature Publishing Group
    Nature 179 (1957), S. 482-482 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Both the cells of the sensory pore X organ and those of the medulla torminalis ganglionic X organ1 are derived from neuroblasts in the anterior wall of the medulla terminalis ganglion layer. The first onion body1 appears approximately simultaneously with the compound eye pigment. This agrees with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/179482a0
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  • 2
    Electronic Resource
    Electronic Resource
    The Amphipod, Hyperia galba , an Ectoparasite of the Jelly-fish, Cyanea capillata (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 1749-1749 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recently, I had the opportunity to examine histo-logically the digestive tract of twenty-five specimens ofH. galba from Bergen, Norway, which were obtained from Cyanea capillata (L.). I was immediately struck by the presence of empty nematocysts in virtually all the formed food remains encountered ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1831749a0
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  • 3
    Electronic Resource
    Electronic Resource
    A New Species of the Mystacocaridea (Crustacea) (1952)
    [s.l.] : Nature Publishing Group
    Nature 170 (1952), S. 75-76 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A comprehensive description of the new species, which belongs to the genus Derocheilocaris Pennak and Zinn, and its general anatomy, will appear in the reports of the expedition3. The head dorsally has what appears as a segmental border delimiting the part containing the proto-cerebrum (the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/170075b0
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  • 4
    Electronic Resource
    Electronic Resource
    The optic neuropiles and chiasmata of Crustacea (1970)
    Springer
    Cell & tissue research 107 (1970), S. 343-360 
    Details
    ISSN: 1432-0878
    Keywords: Compound Eyes ; Crustacea ; Optic Neuropiles ; Chiasmata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary On the basis of ontogeny and adult morphology, an interpretation of the arrangement of optic neuropiles and fibre connexions of the Crustacean compound eye is presented. In the embryo of phyllopods and decapods, the ommatidia, the lamina ganglionaris, and the medulla externa are developed synchronously from a common medial proliferation zone. As this zone persists in all investigated adult Crustacea that possess compound eyes, such a derivation of the mentioned structures is taken to be universal within the group. The direction of growth of the lamina ganglionaris is parallel with the row of ommatidia, the growth direction of the medulla externa is perpendicular to it and parallel with the long axis of the eyestalk. This arrangement is more or less retained in most adult non-Malacostracan Crustacea, and the axons of fully developed neurons pierce the optic neuropiles and leave and enter on the neuropile side. As a result, there is no chiasma in the non-Malacostracan groups. The Malacostraca have an extra neuropile, the medulla interna, derived from the medulla terminalis. Chiasmata occur between the lamina ganglionaris and the medulla externa, and between the medulla externa and the medulla interna. This difference from the non-Malacostracans depends on the course of the fibres. Those coming from the lamina ganglionaris leave the lamina on the neuropile side and enter medulla externa between the cell bodies in the perikaryon layer of the medulla externa neurons and the neuropile of the medulla. The fibres from the medulla externa to the lamina come from T-shaped neurons and emanate from the perikaryon layer side, entering the lamina on its neuropile side. The fibre relations between the medulla externa and the medulla interna are similar. Thus in both cases, chiasmata are present from the beginning, but they become obvious when the medulla externa rotates through part of a circle. The directed growth of the optic neuropiles and the course of the fibre connexions are consequently crucial to the understanding of the topographic relations between the neuropiles. A pattern with short neurons connecting neighbouring optic neuropiles and long neurons connecting the medulla externa with the central nervous system is common to all crustaceans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336672
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  • 5
    Electronic Resource
    Electronic Resource
    Studies of the fine structure of ovarian interstitial tissue (1970)
    Springer
    Cell & tissue research 109 (1970), S. 195-211 
    Details
    ISSN: 1432-0878
    Keywords: Ovary ; Interstitial cells ; Thecal gland ; Cell types ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the thecal gland of the domestic fowl, is described for the first time. In the fowl, the glands are located as islets of lipid-laden cells in the theca interna and also in the interfollicular regions. They appear as well defined structures, organized like endocrine glands, quite different from the surrounding theca interna cells. Each gland is composed of two different cell types, the steroid-producing cell, and a cell type never described before, named the enclosing cell. Both cell types are surrounded by a common, distinct basal membrane. The steroid-producing cells are characterized by their content of organelles typical of steroid-producing cells in other organs. The enclosing cells are char cterized by their peripheral location within the gland and their membranous contact with the steroid-producing cells, long processes with desmosomes and their relation to the nerve fibers. They do not contain the organelles typically found in steroid-producing cells. So far, the real function of the enclosing cells is unknown. The following structures are demonstrated in ovarian steroid-producing cells of the fowl for the first time: cytoplasmic microtubules and filaments, intramatrical lipid-like droplets, attachment devices, the polarity of the steroidproducing cells of the thecal gland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365241
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  • 6
    Electronic Resource
    Electronic Resource
    Studies of the fine structure of ovarian interstitial tissue (1970)
    Springer
    Cell & tissue research 109 (1970), S. 212-226 
    Details
    ISSN: 1432-0878
    Keywords: Ovary ; Interstitial cells ; Thecal gland ; Innervation ; Domestic fowl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the nerves of the ovarian stroma of the domestic fowl is described for the first time. In the fowl, the nerves are concentrated upon blood vessels, smoth muscles and mainly, the thecal gland with the steroid-producing cells. Myelinated as well as unmyelinated nerve fibers were observed. Numerous axon terminals representing adrenergic and also presumptive cholinergic nerve fibers are regularly seen in membranous contact with steroid-producing cells. In these axon terminals microvesicles are oriented towards the steroid-producing cells indicating a specialization of the surface from axon-to-cell contact. Evidence has been presented that there is a membranous neuro-humoral contact between the peripheral autonomie nervous system and the steroid-producing cells in the ovary. The present investigation has demonstrated that there is morphologic evidence for a nervous control of steroid-producing cells. The physiological importance of this neuro-humoral contact is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365242
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  • 7
    Electronic Resource
    Electronic Resource
    Studies of the fine structure of ovarian interstitial tissue (1970)
    Springer
    Cell & tissue research 109 (1970), S. 227-244 
    Details
    ISSN: 1432-0878
    Keywords: Ovary ; Interstitial cells ; Thecal gland ; Fowl ; Effects of clomiphene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The present paper describes for the first time the fine structure of ovarian steroid-producing cells as seen after administration of clomiphene to the domestic fowl for a 28 days period. The main cytoplasmic changes of the steroid-producing cells were an increase in the number, size and density of the mitochondria, an increase in the smooth surfaced endoplasmic reticulum, the Golgi apparatus, the nucleus and the nucleolus, and a decrease of the lipid droplets. There was also an increase in the number of the nuclear bodies, and this organelle also seemed to develope in size. Its internal structure changed with increased fibrillar material and the presence of small vesicles, similar to coated vesicles. Alterations were also found in the enclosing cells and the theca interna cells, indicating a transformation in these cells toward the morphology of steroid-producing cells. All the observations made are in the same category as those made after administration of gonadotropins and represent hypertrophy. In conclusion, therefore, the present study has demonstrated that administration of clomiphene exerts a stimulating effect on the steroidproducing cells of the theca interna. The mechanism of this effect is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365243
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  • 8
    Electronic Resource
    Electronic Resource
    Studies of the fine structure of ovarian interstitial tissue (1971)
    Springer
    Cell & tissue research 113 (1971), S. 111-132 
    Details
    ISSN: 1432-0878
    Keywords: Ovary ; Interstitial tissue ; Thecal gland ; Fowl ; Influence of steroids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of ovarian steroid-producing cells of the domestic fowl as seen after administration of steroids is described. Diaethylstilboestrol, estradiol and hydroxyprogesterone were given as intramuscular injections for a 28-days period. The main cytoplasmic changes of the steroid-producing cells were an increase in the number and the size of lipid droplets due to a possible expansion of the endoplasmic reticulum and a confluence of the smooth endoplasmic reticulum and the lipid droplets. The mitochondria became paler, markedly reduced in size and number, and contained less cristae. The Golgi apparatus became smaller and tended to disappear. The most prominent nuclear changes were irregular outline of the nuclear membrane, shrinkage of the nucleus, formation of pseudo-inclusions, decreased number of nuclear bodies with a tendency to vacuolization and small nucleoli. These alterations have never been demonstrated in ovarian steroid-producing cells before, and they are consistent with atrophic changes observed in steroid-producing cells in other organs. The present study substantiates the view that the thecal gland must be concerned with endocrine function. The possible functions of the different cell types of the thecal gland are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331205
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  • 9
    Electronic Resource
    Electronic Resource
    Neuronal localization of dopamine and 5-Hydroxytryptamine in some mollusca (1966)
    Springer
    Cell & tissue research 71 (1966), S. 489-498 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The localization of biogenic monoamines in ganglionic tissues from Anodonta piscinalis, Helix pomatia, and Buccinum undatum has been studied by means of the histochemical fluorescence method of Falck and Hillarp. In cerebral, visceral, and pedal ganglia (besides nonfluorescent nerve cells) neurons emitting a green or yellow fluorescence were found. No other cell systems exhibiting a specific fluorescence were observed. An abundance of monoaminergic terminals were found in the central parts of these ganglia. Spectrophotofluorimetric determinations showed that there are large quantities of dopamine and 5-hydroxytryptamine in the tissues investigated. The amounts of dopamine and 5-hydroxytryptamine agree well with the distribution of green and yellow fluorescence, respectively, in the ganglia. There are many similarities between the vertebrate and the molluscan monoaminergic neurons. The morphology of the neurons is the same, the intraneuronal distribution of the monoamines is identical, depletion experiments with reserpine and denervation experiments give the same results, and the synaptic arrangement of monoaminergic fibres on non-adrenergic neurons has the same appearance. Apparently, however, dopamine and 5-hydroxytryptamine are the only monoamines acting as neuronal transmitters in the species investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349609
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  • 10
    Electronic Resource
    Electronic Resource
    Studies of the fine structure of ovarian interstitial tissue (1971)
    Springer
    Cell & tissue research 113 (1971), S. 133-156 
    Details
    ISSN: 1432-0878
    Keywords: Ovary-Interstitial tissue ; Thecal gland ; Fowl ; Influence of Gonadotropins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of ovarian steroid-producing cells of the thecal gland as seen after administration of gonadotropins to the domestic fowl is described. Chorionic gonadotropin and pregnant mare serum gonadotropin were given as intramuscular injections for varying periods (10–28 days). The main cytoplasmic changes of the steroid-producing cells were a marked decrease in the number and the size of the lipid droplets, increase in the density, number and size of the mitochondria, increase in the amount of endoplasmic reticulum, increase in the size of the Golgi apparatus and in the number of the dense bodies. Furthermore, there was also an increase in the size of the nucleus and the nucleolus. The nuclear bodies increased in number and this organelle also appeared to develope in size. Its internal structure changed with increased fibrillary material and the presence of small vesicles, similar to coated vesicles. An increase in the number of pinocytic vesicles was observed at the surface of the steroid-producing cell. Cilia were occasionally observed. Alterations were also found in the enclosing cells and the theca interna cells, indicating a transformation in these cells toward the morphology of steroid-producing cells. These alterations have never been demonstrated in ovarian steroid-producing cells of the thecal gland before, and are consistent with hypertrophic changes observed in steroid-producing cells in other organs. The findings are discussed in relation to the function of the thecal gland and the theca interna. The study substantiates the view that the thecal gland must have an endocrine function and might be the main target of the gonadotropins in the theca interna.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331206
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