Zur Charakterisierung neuronaler und gli�ser Elemente im Epithel des Saccus vasculosus von Knochenfischen

Scanning Electron Microscopic Study on the Saccus Vasculosus of the Rainbow Trout

“…The globules as shown within the coronet cells are not found. Judging from the surface view, this type cell is evidently different from the coronet cells and the supporting cells, and is designated as the third cell type, which is equivalent to the cell type which has been described at the TEM level by several authors (MURAKAMI and YOSHIDA, 1967;JANSEN and FLIGHT, 1969;ZIMMERMANN and ALTNER, 1970;GALER and BILLENSTIEN, 1972). ZIMMER-MANN and ALTNER (1970) have found in serial ultrathin sections that the cells of the third type are bipolar nerve cells and proposed the name "liquor-contact neurone" on the basis of their morphological interconnections.…”

The system of cerebrospinal fluid-contacting neurons.

“…In light microscopic investigations ACNE-positive CSF-contacting neurons were demonstrated as scattered among the coronet and ependymal cells (VIGH-TEIcHMANN et al, 1970a). The ultrastructure of such nerve cells was studied first by ZIMMERMANN and ALTNER (1970) in Perca f luviatilis and Salmo gairdneri and by VIGH et al, (1972) in Cyprinus carpio and Anguilla anguilla.…”

New Insights on Saccus vasculosus Evolution: A Developmental and Immunohistochemical Study in Elasmobranchs

“…Coronet cells are characterized by an apical crown of globule-tipped cilia protruding into the ventricle and have traditionally been considered responsible for the function(s) of the SV [Jansen and Flight, 1969;Altner and Zimmermann, 1972;Rodríguez-Moldes and Anadón, 1988;Corujo et al, 1990]. Classical studies indicated that these cells have axons [Dammerman, 1910], although this has not been confirmed by ultrastructural studies [Zimmermann and Altner, 1970]. No neuroactive substances have been shown in coronet cells but immunohistochemical and in situ hybridization studies have shown that these cells contain peptides and receptors related to calcium homeostasis [Ingleton et al, 1995;Devlin et al, 1996;Akino et al, 1998;Flanagan et al, 2002] supporting the hypothesis that coronet cells, as some glial cells, are involved in ion transport [Jansen et al, 1981[Jansen et al, , 1982.…”

“…Histochemical studies of the SV in teleosts have revealed acetylcholinesterase activity (AChE) in CSF-c neurons [Vigh-Teichmann et al, 1970;Zimmermann and Altner, 1970;Jansen and West, 1971;Vigh et al, 1972]. Immunoreactivity to choline acetyltransferase, the acetylcholine-synthesizing enzyme, has been reported in these SV cells in sturgeon [Adrio et al, 2000], but not in trout or dogfish [Pérez et al, 2000;Anadón et al, 2000].…”

“…In teleosts, the conspicuous saccofugal tract (SV tract; tractus sacci vasculosi) coursing to the posterior tubercle is AChE positive [Zimmermann and Altner, 1970;Vigh et al, 1972]. These saccofugal projections were experimentally investigated with tract-tracing methods and shown to contain GABA-, GAD-and NPY-immunoreactive fibers in trout [Yáñez et al, 1997].…”