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  • 1
    ISSN: 1432-0878
    Keywords: Pituitary ; Thyrotroph hormone ; Bacilliform inclusions ; Teleostei, Cichlidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Thin sections and replicas of freeze-etched pituitaries from six species of the teleostean family of Cichlidae were studied by electron microscopy. Four species belonging to the genus Tilapia exhibit rod-like structures, i.e., “bacilliform inclusions” (BI), about 1–2 μm in length in cells of the proximal Pars distalis. The BI are found either isolated or fused in small groups. They are enclosed in an envelope similar to that of secretory granules. Both the BI and the secretory granules give a positive PAS-reaction.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 199 (1979), S. 397-407 
    ISSN: 1432-0878
    Keywords: Pituitary ; Teleostei ; Freeze-fracture ; Extravascular spaces ; Exocytosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The structure of membranes in the pituitary of several teleostean species was studied with the freeze-etching technique. Nuclear pore density is higher in hormone-secreting than in stellate cells, suggesting a higher rate of nucleo-cytoplasmic interactions in the secretory cells. The perinuclear endoplasmic reticulum (ER) in the MSH-secreting cells has a large number of fenestrae, whereas in the ER whorls of the prolactin-secreting cells the fenestration occurs only rarely. Three different types of membrane specializations are described, presumably related to exo-endocytotic events at the level of the plasmalemma.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 103 (1970), S. 429-446 
    ISSN: 1432-0878
    Keywords: Insect CNS ; Deutocerebrum ; Experimental degeneration ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Bei Calliphora vicina und Periplaneta americana wurde mit Hilfe experimentell erzeugter anterograder Degeneration der Verlauf von Axonen antennaler Rezeptorzellen im Oberschlundganglion verfolgt. Nach Abtrennen einer Antennengeißel (die beiden proximalen Segmente bleiben intakt) findet man degenerierte Nervenfortsätze in den Glomeruli des ipsilateralen Deutocerebrum. Bei Calliphora laufen viele dieser Axone über eine Bahn dorsal des Oesophagus in die Glomeruli des contralateralen Deutocerebrum. Ein großer Ast des Antennennerven Calliphora zieht vorbei an der Region der Glomeruli in posteriore Regionen des Oberschlundganglions. Nach Abtrennen der ganzen Antenne einschließlich der proximalen Segmente findet sich in diesem Trakt eine große Zahl degenerierter Axone. Die Synapsen in der Region der Glomeruli ähneln anderen Synapsen, wie sie im Zentralnervensystem von Insekten bisher beschrieben wurden.
    Notes: Summary Pathways of axons from antennal receptor organs into the brain have been traced by means of anterograde experimental degeneration in Calliphora vicina and Periplaneta americana. After removal of one antennal flagellum (with the two proximal segments left intact) degenerating nervous processes were found in the glomeruli of the ipsilateral deutocerebrum. In Calliphora a great number of these axons run via a pathway dorsal to the oesophagus into the glomeruli of the contralateral deutocerebrum. A big branch of the antennal nerve of Calliphora runs toward a posterior region of the brain bypassing the glomerular region. After removal of the whole antenna including the proximal segments degenerations can be seen also in this branch on the ipsilateral side. The synapses in the glomerular region of the deutocerebrum resemble other central synapses in insects described so far (electron dense cleft, often ribbon-like dense structures within the presynaptic element near or at the synaptic membrane, clear vesicles etc.).
    Type of Medium: Electronic Resource
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