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Quarterly Journal of Microscopical Science, Vol s3-104, 465-469, Copyright © 1963 by Company of Biologists

The Histophysiology of the Saccus Vasculosus of Notopterus Chitala (Teleostei)

BANGALORE I. SUNDARARAJ 1 and M. R. N. PRASAD 1

1 The Department of Zoology, University of Delhi, Delhi, 6 India

The apical protrusions of the coronet cells of the saccus vasculosus in Notopterus chitala contain glycogen which passes through the hairs into the globules. In spite of the availability of normal blood-glucose levels in fed controls, only a few cells in the loculi show glycogen; thus there are individual differences in the physiological activity of the cells. Specific variations in the distribution of glycogen in the different parts of the coronet cells were observed under conditions of starvation and glucose administration. Starvation for 48 h resulted in depletion of glycogen unidirectionally from the apical protrusion towards the globules. Fish starved for 46, 44, and 42 h were injected intraperitoneally 20% glucose (2 g of glucose per kg of body-weight) and autopsied 2, 4, and 6 h respectively after glucose administration. Comparison of the results obtained with starved fish injected with glucose suggests the gradual conversion of blood-glucose into glycogen. This conversion appears to begin at the base of the cell-body and to move towards the apical protrusion. The saccus vasculosus in Notopterus chitala is possibly a source of glucose for the cerebrospinal fluid.






© The Company of Biologists Ltd 1963