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Secretion by ependymal cells of the neurohypophysis and saccus vasculosus of Polypterus ornatipinnis (osteichthyes)
Author(s) -
Marquet Eugene,
Sobel Harold John,
Schwarz Ruth,
Weiss Martin
Publication year - 1972
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051370107
Subject(s) - ependymal cell , biology , cilium , secretion , anatomy , apocrine , cerebrospinal fluid , microbiology and biotechnology , central nervous system , neuroscience , endocrinology
Abstract Electron microscopic studies of the neurohypophysis and saccus vasculosus of the bichir ( Polypterus ornatipinnis ) reveal an apocrine release of secretory material by ependymal cells (e.g., crown cells). The secretory material appears to migrate along the microtubular apparatus and the ciliary filaments to the cell buds. It is postulated that the formation of the buds and their release is mediated by cilial action. Secretion buds are noted in the cerebrospinal fluid and vascular sinusoids. Bulbous projections of neurohypophyseal secretory tracts extend into the ependymal lumen which also contains elementary secretion granules. Specialized “liquorkontaktneurone” are interspersed with ependymal cells. An interrelation between the hypothalamus, neurohypophysis, saccus vasculosus, and the meta‐adenohypophysis is postulated.