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Books > Science & Mathematics > Biology, life sciences > Life sciences: general issues > Neurosciences
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The Subcommissural Organ - An Ependymal Brain Gland (Paperback, Softcover reprint of the original 1st ed. 1993)
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The Subcommissural Organ - An Ependymal Brain Gland (Paperback, Softcover reprint of the original 1st ed. 1993)
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During the past two decades the progress in neuroendocrine
research, stimulated by the increasing general interest in
neurosciences, has been very impressive. Most of these efforts have
concentrated on peuroendocrine nerve cells and their systems. Even
if some aspects have remained open to discussion, the principal
functional role of the neuroendocrine units capable of elaboration
of biological active peptides (peptidergic neurons) is quite well
understood. The same holds true for the central aminergic neurons
and for such photoreceptor-derived paraneuronal elements as the
pinealocytes. The primordium of the central nervous system
possesses potencies for central sensory and secretory
differentiations. Among the latter, a non-neuronal ependymal
structure - the subcommissural orga- has remained enigmatic in
terms of its biological significance. The sub commissural organ is
a common, very constant, and conservative property of the
vertebrate brain, from cyclostomes to mammals, and its appears
early in ontogeny. The spectacular secretory activity of this brain
gland, located in the diencephalic roof at the entrance to the
mesencephalic aqueduct, results in the formation of an
intraventricular secretory product - Reissner's fiber. This
peculiar structural complex has attracted investigators to use a
wide spectrum of modern cytological and, more recently, also
molecular methods to investigate the secretory process and the
secretory product, primarily glycoproteins, in greater detail. So
far, however, the progress in structural insight has outpaced our
knowledge of the function of the subcommissural organ."
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