Some Macroscopic and Microscopic Observation on The Pituitary Gland of Adult Male Donkey (equas-asinus)

This research was performed using gross anatomy and a light microscope to detect some morphological and functional relationships of the pituitary gland in adult male donkey. For the anatomical and histological characteristics of the donkey pituitary, 14 adult normal animals were selected; all morphological descriptions were collected prior to preservation and midsagittal sectioning. Pituitary samples were preserved in 10% nutrient buffered formalin then it was processed and stained with routine H&E stain, Masson Trichrome and modified staining methods (AB+PAS Orange G+PAS). With an average of 1.6 g, the weights ranged from 1.3g to 1.7g, with the diameter of the gland being (length19.00 mm, width 20.7mm). The shape of the gland was round flattened; the anterior lobe was brown in color, but the posterior lobe was pale. Microscopically; a thin layer of C.T capsule derived from Dura matter was enclosed around the gland. There are two main components of the donkey pituitary: completely formed Adenohypophysis and neurohypophysis; pars distalis and pars intermedia are the Adenohypophysis. It was made up of the "adenohypophyis" epithelial glandular component and the "neurohypophysis" nervous component. The pars distalis was located laterally and pars nervosa in center of gland. Three major cell groups were composed of Pars distalis: acidophils, basophils and chromophobes. Most of the acidophils were Lateral of the gland and few cells in middle. The gonadotropes basophilis of donkey were located around the capillary sinusoids.