. The anatomy of the domestic animals . Veterinary anatomy. 558 THE URINARY ORGANS OF THE HORSE Chauveau gives as an average 750 grams for the right kidney and 710 grams for the left. Ellenberger and Baum (24 cases) give the right kidney as varying between 430 and 840 grams; and the left between 42o and 7S0; this is an average of 635 grams (about 22 J 2 ounces) for the right kidney, and grams (about 21}^ oimces) for the left. They give the relation of the weight of both kidneys to the body-weight as 1: 255-344. In a Percheron mare weighing about 2000 pounds the right kidney weighed 4 pou
. The anatomy of the domestic animals . Veterinary anatomy. 558 THE URINARY ORGANS OF THE HORSE Chauveau gives as an average 750 grams for the right kidney and 710 grams for the left. Ellenberger and Baum (24 cases) give the right kidney as varying between 430 and 840 grams; and the left between 42o and 7S0; this is an average of 635 grams (about 22 J 2 ounces) for the right kidney, and grams (about 21}^ oimces) for the left. They give the relation of the weight of both kidneys to the body-weight as 1: 255-344. In a Percheron mare weighing about 2000 pounds the right kidney weighed 4 pounds 3 ounces, and the left one 4 pounds. In a horse of medium size the right kidney is about sLx inches (ca. 15 cm.) in length, about the same in width, and about two inches (ca. 5 cm.) thick. The left kidney is about seven inches (ca. 18 cm.) long, four to five inches (ca. 10 to 12 cm.) wide, and two to two and a hah inches (ca. 5 to 6 cm.) thick. Structure.—The surface of the kidney is covered by a thin but strong fibrous capsule (Tunica fibrosa), which is in general easily stripped off the healthy kidney; it is continued into the renal sinus, where it is attached. Sections through the kidney show it to consist of an external cortical substance and an internal medullary substance. The cortical substance (Substantia corticahs) is red brown in color and has a granular appearance. It is dotted over with minute dark points; these are the renal corpuscles (Corpuscula renis),^ each consisting of the dilated origin of a uriniferous tubule (Capsula glomeruli), with an invaginated tuft of capillaries (Glomerulus) enclosed by it. The medullary substance (Substantia medullaris). Renal crest 4 Pelns Renal Branches Ureter rem of renal artery Fig. 499.— Section of Right Kidney op Horse Passing Through the Hilus. Posterior portion of organ hardened in situ. Note curvature of dorsal surface. is more resistant and presents a distinct radial striation. Its central part is pale,
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