Licht- und elektronenmikroskopische Untersuchungen des Saccus vasculosus und des Nervus und Tractus sacci vasculosi

Translated title of the contribution: Light and electron microscopic studies of the vascular sac and of the nervus and tractus sacci vasculosi

B. Vigh, I. Vigh-Teichmann, B. Aros, P. Varjassy

Research output: Contribution to journalArticle

20 Citations (Scopus)


The vascular sac of Anguilla anguilla, Cyprinus carpio and Amiurus nebulosus has been studied by light microscopy using AChE reaction and the fluorescence histochemical method for the demonstration of monoamines, and by electron microscopy. As demonstrated light microscopically, the cerebrospinal fluid (CSF) contacting neurons and their processes exert a strong AChE activity, while the coronet cells are inactive. The AChE-positive processes of the neurons form bundles that enter the nervus sacci vasculosi and pass on in the tractus sacci vasculosi. After crossing to the opposite side, this AChE-positive bundle can be traced into the neuropil of the ventral thalamus. Neither the CSF contacting neurons of the vascular sac, nor the nervus, tractus and nucleus sacci vasculosi show any monoamine fluorescence. As demonstrated electron microscopically, there are synapses on the perikarya of the coronet cells, their presynaptic cytoplasm being characterized by mitochondria, synaptic and granulated vesicles (diameter about 800 to 1000 Å). The perikarya of the CSF contacting neurons contain dense-core vesicles (diameter about 700 to 900 Å) besides of the usual cytoplasmic components. Axons displaying granulated vesicles with a diameter of 800 Å or 1300 Å, form synapses on these perikarya. In the basal part of the saccus epithelium, there are nerve fibres of different calibres containing dense-core vesicles (diameter about 800 Å or 1400 Å) and forming synapses. The nervus sacci vasculosi is characterized by thin and thick, unmyelinated nerve fibres, and rare synapses, while the tractus sacci vasculosi is composed of mainly small, unmyelinated fibres.

Original languageGerman
Pages (from-to)508-522
Number of pages15
JournalZeitschrift für Zellforschung und mikroskopische Anatomie
Issue number4
Publication statusPublished - Dec 1 1972



  • AChE-positive fibre connections
  • Cerebrospinal fluid contacting neurons
  • Saccus vasculosus
  • Synapses on coronet cells
  • Ultrastructure

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology
  • Cell Biology

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