Browsing by Author "V.K.S. Sastry"

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A comparative study of the pineal complex of nineteen species of Indian freshwater fishes
(1981) V.K.S. Sastry; A.G. Sathyanesan
[No abstract available]
Morphology of the pineal organs of Mystus aor (Ham.) and Puntius sophore (Ham.) with special reference to their innervation
(1981) V.K.S. Sastry; A.G. Sathyanesan
In Puntius sophore and Mystus aor the pineal end-vesicle (EV) has a prominent lumen which is in open communication with the third ventricle through the long hollow stalk. In both the species the EV as well as the stalk have all the three component cell types, namely sensory epithelial, supportive and nerve cells. The outer segments of the photoreceptor cells gave positive reaction to PAS, alcian blue, aldehyde fuchsin, sudan black, acetic thionin and Heidenhains' iron hematoxylin, but almost negative to toluidine blue. Apart from the Palmgren, Cajal and Golgi nerve impregnation techniques, the neurons could be identified with the aid of Heidenhains' iron hematoxylin, acetic thionin and toluidine blue. They are arranged in all planes generally in contact with the synaptic pedicles of the sensory epithelial cells. The axons of the neurons present both in EV and stalk contribute to the formation of the pineal tract which courses down the pineal stalk. Rapid Golgi technique is apparently selective as only a small number of neurons are impregnated. But with Cajal and Palmgren the intense maze of axons present in the pineal could be demonstrated. In both species the bulk of the pineal tract could be traced into the posterior commissure and subcommissural organ. However, in P. sophore some projections are seen entering the optic tectum and the ependymal lining of the third ventricle.
Pineal innervation of the third ventricular ependyma in the teleost, Puntius sophore (Ham.)
(Springer-Verlag, 1982) A.G. Sathyanesan; V.K.S. Sastry
In the teleost Puntius sophore a well defined pineal tract intersects the posterior commissure at right angles and enters the ependymal layer in the roof of the third ventricle. In the ependymal layer it gives out varying number of branches which are in morphological contact with the component cells. Few branches apparently project into the third ventricles also. Further, EM studies would confirm the site of their constituent axonal endings. Such a direct pineal pathway projecting into the ependyma and third ventricle may be of great functional importance. © 1982 Springer-Verlag.