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Microanatomy of pars tuberalis and intermedia of pituitary gland in madras red sheep (Ovis aries)

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Author: 
Paramasivan, S. and Geetha Ramesh
Abstract: 

Microanatomical observations were recorded on the pituitary glands of various age groups of Madras red sheep. The pars tuberalis appeared as a thin sleeve and surrounded the infundibular stalk separated by a thin connective tissue layer. It was located at rostro-ventral part of pituitary stalk, extended downward and backward and mingled with the pars distalis at zona tuberalis without any line of demarcation. The hypothalamic-hypophyseal portal system originated in the primary capillary plexus in the median eminence supply the anterior pituitary by passing through pituitary stalk. The pars tuberalis consisted of longitudinally oriented cells cords and follicles separated by sinusoids. Pars tuberalis consisted mainly of gonadotrophs interspersed with few corticotrophs and thyrotrophs, histologically resembling those of pars distalis. Somatotrophs and lactotrophs were not identified. The pars intermedia was located along the anterior, ventral and lateral walls of the neurohypophysis and formed the caudal wall of the hypophysial cavity. The pars intermedia composed of basophilic cells arranged in clusters or cell cords along with scattered choromphobes. A bee-hive shaped or elliptical projection of the pars intermedia called as cone of Wulzen was noticed in the middle of the hypophysial cavity. The hypophysial cavity was well developed and seen in all age groups of animals in the present study. Cysts of various sizes and shapes in pars distalis and pars intermedia of the adenohypophysis.

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