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Thyroxine and hypothalamic neurosecretory system in chick embryos

  • Published:
Proceedings / Indian Academy of Sciences

Abstract

Thyroxinisation of chick embryos brings about the appearance of stainable neuro-secretory material a day earlier than what is found in the control embryos. The Gomori-positive granules are found to appear first in the lateral group of neurons of the supra-optic nucleus. This is so in the treated as well as in the control embryos.

It is observed that in the thyroxinised as well as control embryos, the fuchsinophil granules appeared much later in the paraventricular nucleus but in the thyroxinised embryos, the granules appeared consistently a day earlier than in the controls.

The interesting phenomenon observed is that when the supra-optic nucleus got depleted of the stainable granules, the pericapillary part of the median eminence got deposited with the Gomori-positive granules. Similarly when the paraventricular nucleus got depleted, the neural lobe was seen getting filled with the fuchsinophil granules.

In all the cases, the depletion and deposition of the stainable granules took place a day in advance in the thyroxinised embryos than in the controls. The purpose of this precocious appearance of the stainable granules in the thyroxinised embryos is inexplicable without further experimentation.

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Authors and Affiliations

  1. Surgical Research Laboratory, Institute of Medical Sciences, Banaras Hindu University, Varanasi-5

    Kamalaveni Chandrasekhar

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  1. Kamalaveni Chandrasekhar
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Communcated by Prof. K. Pampapathi Rao,f.a.sc.

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Chandrasekhar, K. Thyroxine and hypothalamic neurosecretory system in chick embryos. Proc. Indian Acad. Sci. 76, 97–105 (1972). https://doi.org/10.1007/BF03050651

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  • DOI: https://doi.org/10.1007/BF03050651

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