Electron-microscopic identification of mesenccphalic neurosecretory cells in teleosts

Kenneth Miller, Richard M. Kriebel

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Abstract

Neurons in the dorsal tegmentum of the midbrain of the teleosts Poecilia sphenops and P. latipinna were examined by use of electron microscopy. A nucleus of neurosecretory neurons was identified in the subependymal region just dorsal to the medial longitudinal fascicle. This nucleus has been called the dorsal tegmental magnocellular nucleus (DTMN). The most distinguishing cytological feature of these cells is the presence of large granular vesicles, 100-180 nm in diameter. These vesicles resemble neurosecretory granules characteristically found in preoptic and lateral tuberal magnocellular neurosecretory cells. Presynaptic terminals on these cells contain small clear vesicles, and some among them contain small dense-core vesicles.

Original languageEnglish
Pages (from-to)445-448
Number of pages4
JournalCell and Tissue Research
Volume242
Issue number2
DOIs
StatePublished - 1 Nov 1985

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Keywords

  • Brain stem nuclei
  • Electron microscopy
  • Extrahypothalamic neurosecretory neurons
  • Teleost mesencephalon

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