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Supraependymal nerve fibers in human brain correlative transmission and scanning electron microscopical and fluorescence histochemical studies



Supraependymal nerve fibers in human brain correlative transmission and scanning electron microscopical and fluorescence histochemical studies



Neuroscience 5(8): 1489-1502



Supraependymal, varicose nerve fibers were observed in human post-mortem brain when ventricle surfaces were examined by transmission and scanning electron microscopy. Transmission electron microscopy revealed the presence of numerous profiles of nerve terminals, containing small electron-lucent vesicles and large dense-cored vesicles and axons with their characteristic neurotubules. Occasionally desmosome-like junctions were found between the nerve terminals and the adjacent ependymal cells. Scanning electron microscopy demonstrated the topographical distribution of varicose nerve fibers traversing among clusters of cilia and numerous microvilli on the ventricle surface. These nerve fibers, which were most frequently observed in the interventricular foramen, often coursed in bundles. In 1 of 5 cases, a discrete formaldehyde-induced fluorescence typical of 5-hydroxytryptamine (yellow color and rapid fading upon violet-blue irradiation) was observed on the floor of the 4th ventricle. Supraependymal nerve fibers in human brain are probably identical to similar nerves previously characterized as serotoninergic in rat brain and occurring in several other mammalian brains.

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Accession: 006546041

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PMID: 7402482



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