TOPOGRAPHY AND HISTOLOGY OF PAROTID GLAND IN ONE HUMPED CAMEL
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Abstract
The parotid salivary gland in one humped camel (camelus dromedarius) is located along the caudal edge of the ramus of mandible and on the masseter muscle. The gland has a long triangular outline and a red-brown color. The lateral surface is covered by parotid fascia and the cutaneous and parotido-auricularis muscles. It is bounded dorsally by zygomatico-auricularis muscle. The gland takes its blood supply from three branches which come from the facial artery that supply the middle and distal part of the gland, while the proximal part receives its blood supply from the superficial temporal and cranial temporal arteries. The parotid duct of the gland passes over the lateral surface of the masseter muscle, inferior to the orbital cavity and opens into the opposite 4th upper cheek tooth.
Histologically, the gland appears as compound tubulosaccular and with serous secretion. It has a lobular structure with a functional unit that resembles the acinus. The acini are lined by cells which are pyramidal in shape and contain zymogen granules with spherical, centrally located nuclei. The interlobular ducts are connected by straight ducts and took a straight course. The epithelial lining of the straight ducts are cuboidal to tall columnar cells.
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