DEVELOPMENTAL SEQUENCE OF ENDOCRINE GLANDS IN SHEEP (Ovis aries)
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Date
2021
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TANUVAS, CHENNAI
Abstract
Studying the developmental anatomy of endocrine glands helps to understand the timing of embryological events to maintain normal homeostasis of body and to analyse birth defects. Sheep acts as an excellent model for the study of endocrine system. Samples of pituitary, pineal, thyroid, parathyroid, pancreas, adrenal, testes and ovary were collected from pre and postnatal groups of sheep.
Pituitary gland in sheep was an oval shaped, pale pink coloured dorsoventrally flattened gland lodged in the sella turcica of post sphenoid bone. In group I, Rathke’s pouch formation was seen at 25 days of gestation. In group II, at 55 days of gestation, in pars distalis cells were differentiated into chromophils and chromophobes, at 85 days of gestation chromophils were differentiated into acidophils and basophils. In group III, the number of cells and capillaries were increased. In group IV, acidophils were grouped as clumps and basophils were found distributed between these clumps. In group V, delta basophils were more and in group VI, beta basophil were numerous. In pars intermedia basophilic cells and in pars nervosa pituicytes and nerve fibres were noticed.Chromophilic cells showed moderate PAS, Millon’s, alkaline phosphatase, weak acid phosphatase and strong alpha naphthyl acetate esterase reactions.