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The hypothalamo neuro hypophyseal system in indian fresh water goby glossogobius giuris



The hypothalamo neuro hypophyseal system in indian fresh water goby glossogobius giuris



Zeitschrift fuer Mikroskopisch-Anatomische Forschung (Leipzig) 93(6): 1137-1158



The hypothalamo-neurohypophysial neurosecretory system in Indian fresh-water goby, G. giuris is described. The tractus preoptico-hypophyseus serves the function of a morphological and physiological connection between the hypothalamus and pituitary gland. In addition to main mass of the nucleus preopticus cells (cystine/cysteine bearing), a group of few cells in the hypothalamus was observed. These cells are situated posterior to the position of the nucleus preopticus and are chrome alum hematoxylin phloxine positive aldehyde fuchin positive. The neurosecretory material in the cells of nucleus preopticus is in the form of fine granules. The nucleus lateralis tuberis is absent in this fish. The disposition of neurosecretory material is heaviest along the fibers of the neurohypophysis in the region of pars intermedia with which it forms a profuse interdigitation. The fibers usually terminate over the blood vessels. The Herring bodies are noticeable at different levels in the neurohypophysis and pars-distalis. Besides the neurosecretory fibers, Herring bodies, non-stainableneurosecretory fibers and blood vessels, pituicytes are also present in the neurohypophysis. The intraaxonal flow of neurosecretory material, the vascularization of the nucleus preopticus and hypothalamo-hypophysial regulatory mechanism are discussed.

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