The present study was investigated the histological structure of the vesicular glands of eight mature castrated and noncastrated zaraibi bucks (4 animals/ each group). Generally, the vesicular gland of bucks was compact and lobulated gland. It was covered by a muscular capsule sending fibro-muscular septa dividing the gland into irregular unequal lobules. Each lobule was formed of numerous secretory acini and few amount of inter-acinar connective tissue stroma. Each lobule had a central collecting sinus to collect the secretions from the different acini. Both secretory acini and central collecting sinuses were lined mainly with pseudostratified columnar epithelium that was consisted mainly of secretory columnar cells and few small basal cells. The secretion was released into the acinar limen via apocrine mode. The castrated bucks showed more connective tissue and less acinar components in comparison to non-castrated bucks. Such finding represents the histological difference between the vesicular gland of castrated and non-castrated bucks that pointed out the effect of castration on structure of the vesicular gland.
Blood calcium level can be controlled by the action of parathyroid gland on the bone via parathyroid hormone that responsible for bone mineralization. The study aimed to demonstrate the developmental histological structure of parathyroid gland and bone from one day after birth to twenty-four month. Forty-five male Guinea pigs, immature and mature were used for this study. Samples were taken from parathyroid gland and bone and processed for histological examination. Parathyroid gland formed of fibrous capsule and fine septa extending to cellular parenchyma which contained both chief and oxyphil cells. From age of 1 day to 17 month, only chief cells with no differentiation were present in parathyroid gland. Chief cells cytoplasm might be granular, vacuolated, or empty according to secretory activity of cells. At 18 month, oxyphil cells started to appear however, chief cells were differentiated into dark and light cells at 24 months. Compact bone was characterized by regular bone lamellae around vascular Haversian vessels that penetrated the bone instead of Haversian canals in Guinea pig. At early life, bone was not completely ossified forming from hyaline cartilage and spongy bone. Vertebrae were completely ossified at 4 month of age and consisted of spongy bone. At 2 weeks and 1 month, femur and ribs were completely ossified consisting of compact bone.
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