Morphological Description and Histological Structure of Kidney in Iraqi Black Partridge Francolinusfrancolinus (Linnaeus, 1766)

Abstract

The morphological description and histological structure of Kidney in Iraqi black partridge Francolinus francolinus have been investigated. Results of morphological description declared that Iraqi black partridge have pair of elongated large solid kidneys which are situated symmetrically on both sides of vertebral column in a bony depression called renal fossa within the synsacrum. Each kidney consist of three lobes represented by cranial, middle and caudal lobes, the surface of three lobes of kidney was containing small depressions in Francolinus francolinus and the kidney covered by capsule of connective tissue. For each kidney in Francolinus francolinus has ureter originated from the posterior end of cranial lobe and extend on the ventral surface of middle and caudal lobes and opened at urodeum within the cloaca. Microscopical examination showed that the basic unit of kidney in Iraqi black partridge represented by lobules which have oval shaped and each of them consist of cortex and medulla, and the cortex occupies more area than that of medulla. Histological study showed that the glomeruli in Iraqi black partridge represented by relatively small spherical structure and each glomerulus has vascular and urinary poles and the glomeruli distributed randomly within the kidney tissue and they are concentrated near the medulla and each glomerulus covered by capsule called Bowman's capsule. The results of present study showed that the tubules of kidney represented by proximal convoluted tubules, distal convoluted tubules, loops of Henle's in addition to the collecting tubules which lead to collecting ducts. The lining of kidney tubules represented by simple cuboidal epithelium with brush border in proximal convoluted tubules while the lining of distal convoluted tubules were represented by simple cuboidal epithelium without brush border in free surface of cells. The lining of thick and thin segments of Henle's loop were represented by simple cuboidal epithelium appeared Low cuboidal in thin segment. The collecting tubules have lining ranged from simple cuboidal to low columnar while it was simple columnar in collecting ducts.The results of the present study showed that the ureter walls consist of three layer represented by internal layer of ciliated pseudostratified columnar epithelium, the middle layer which is the muscular layer and the external layer of loose connective tissue. The lumen of ureter appeared irregular in Francolinus francolinus.