Liquorkontaktneurone im Nucleus paraventricularis

Translated title of the contribution: Liquor contacting neurons in the paraventricular nucleus

I. Vigh-Teichmann, B. Vigh, S. Koritsánszky

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The neurosecretory paraventricular nucleus of reptilia was studied light and electron microscopically. Nerve cells of this nucleus form ventricular processes which as club-like endings - "liquor contacting nerve endings" - protrude into the lumen of the 3rd ventricle. - The paraventricular nucleus of the turtle, Emys orbicularis, is built up of a proximal neuronal layer situated close to the ependyma, and of a distal group of neurons. Synaptic zones can be found between the cell rows. As demonstrated electronmicroscopically, the club-shaped liquor contacting nerve endings show elements of the endoplasmic reticulum, free ribosomes and mitochondria in various amounts. The terminals contain neurosecretory elementary granules (diameter about 1,300-1,800 Å) and bear atypical cilia supplied mostly with two basal bodies and long rootlet fibres. The liquor contacting nerve endings are connected by desmosomes with the neighbouring ependymal cells and sometimes with one another. - In the lumen of the 3rd ventricle, also small axons containing catecholamine granules, can be found. These neurites form synapses with the liquor contacting nerve terminals of the paraventricular nucleus. Furthermore, synapses situated on the ventricular and peripheral nerve processes and on the neurosecretory perikarya, are described. In the synaptic zones, axodendritic synapses occur; the dendrite contains neurosecretory elementary granules. - The morphological similarity between neurosecretory liquor contacting nerve terminals and those of the liquor contacting neuronal system is stressed. On the basis of the results, the significance and function of the neurosecretory liquor contacting terminals is discussed in connection with the exchange of informations between cerebrospinal fluid and the neuroendocrine system.

Translated title of the contributionLiquor contacting neurons in the paraventricular nucleus
Original languageGerman
Pages (from-to)483-501
Number of pages19
JournalZeitschrift für Zellforschung und mikroskopische Anatomie
Volume103
Issue number4
DOIs
Publication statusPublished - Dec 1 1970

Keywords

  • Cerebrospinal fluid
  • Contacting neurons
  • Neurosecretion
  • Paraventricular nucleus

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology
  • Cell Biology

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