Ultrastructural evidence for the presence of secretory cells in the pineal parenchyma ofHeteropneustes fossilis |
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Authors: | S Srivastava |
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Institution: | (1) Department of Zoology, University of Delhi, 110 007 Delhi, India |
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Abstract: | There is an extensive literature dealing with the study of indoles, especially serotonin and melatonin, but with considerably
less emphasis on the cells and cell types involved in the synthetic process. In the present electron microscopical investigation
of the pineal end vesicle ofHeteropneustes fossilis, pinealocytes have been revealed in the pineal parenchyma characterized with extensive synthetic apparatus viz., rough endoplasmic
reticulum, free ribosomes, lipid droplets, mitochondria and Golgi bodies. Two sub-populations of the pinealocytes are easily
distinguishable on the basis of electron opacity and the preponderance of one or other morphological profile: light cells
and dark cells. Light cells represent the active phase of secretion while dark cells represent the storage and release phase
of secretion. A neuroendocrine role for the pineal body inHeteropneustes fossilis is suggested which may be significant in view of the nocturnal habit of the fish.
Dedicated to my father, Prof. C B L Srivastava |
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Keywords: | Pineal pinealocytes secretory activity light cells dark cells |
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