KIDNEYS. 



3 



structure, and which is continued on, and forms a sheath for, 

 the vessels of the kidney. The surface is smooth in the 

 horse, dog, sheep, cat, and almost all other animals; it is, 

 however, divided into several lobes in the ox, preserving in 

 this animal, during extra-uterine life, the form in which we 

 find the organ in all animals during foetal life. (Fig. 149). 



Fig. 149. Shows the lobulated external surface of the Kidney of the Ox. 



The kidney possesses a large vein called the renal vein, 

 and a large artery called the renal artery. Having reached 

 the hilus of the kidney, these vessels break up into several 

 branches. The nerves of the kidney are derived from the 

 solar plexus, and form a network around the blood-vessels. 



We notice, on making a transverse section through the 



