. The comparative anatomy of the domesticated animals. Veterinary anatomy. URINARY APPARATUS. little behind the Wolffian bodies. They are then very distinctly lobiilated, but the lobes gradually become fused, and have entirely disappeared at birth ; the small irregularities on the surface are the only indications of their ever having existed in Solipeds. Functions.—The kidneys are the organs which secrete the urine ; but this secretion does not take place to the same extent in all parts of their tissue. The abundance of vessels in the cortical Fig. TRANSVERSE SECTION OF THE KIDNEY. 1, In
. The comparative anatomy of the domesticated animals. Veterinary anatomy. URINARY APPARATUS. little behind the Wolffian bodies. They are then very distinctly lobiilated, but the lobes gradually become fused, and have entirely disappeared at birth ; the small irregularities on the surface are the only indications of their ever having existed in Solipeds. Functions.—The kidneys are the organs which secrete the urine ; but this secretion does not take place to the same extent in all parts of their tissue. The abundance of vessels in the cortical Fig. TRANSVERSE SECTION OF THE KIDNEY. 1, Inferior border ; 2, cortical tissue ; 3, section of blood-vessels; 4, pelvis; 5, ureter; 6, superior border; 7, renal artery; 8, proper capsule. of substance, the presence of the Mal- pighian corpuscles, and the flexuosi- ties described by the uriniferous tubes, sufficiently indicate that this substance should be the principal, if not the exclusive, seat of the secre- tory function. But in what manner does this secretion take place ? At present it is generally agreed that the urinary secretion is simply an infiltration of the elements of the urine contained in the blood, through the walls of the vessels of the glome- rulus. The difference existing be- tween the diameter of the afferent and efferent vessels of the Malpighian glomerules—a fact the importance of which was pointed out by Ludwig the urine through the tissue of the —sufficiently explains this filtration kidneys. The nutritive principles of the serum which leave the blood at the same time as those of the urine, are taken up by the epithelium of the uriniferous tubes. 2. The Ueeteks (Fig. 338). Form.—The ureter is a membranous canal, the diameter of a thick goose- quill, which conveys the urine from the pelvis of the kidney into the bladder. Its origin, course, termination, and structure, will be successively considered. Orif/in.—It has been already shown that the origin of the ureter is at tKe infundibulum of
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