162 EQUINE ANATOMY. 



has a notch for posterior vena cava. Extremities : right 

 adheres to the duodennm, left looks towards base of 

 spleen. Structure : Like the salivary glands. Excre- 

 tory apparatus consists of two canals, that of Wirsung 

 and its accessorius ; they open in the duodenum, oppo- 

 site each otlier. 



Kidneys.— Situation : To the left and right of the 

 sub-lumbar region, the right being more forward than 

 the left. Form : riglit is like the heart on a playing 

 card, the left resembles a haricot bean. Division : Two 

 faces, smooth ; three borders, internal forms the fissure 

 or hilus. Weight: right, about twenty-seven ounces, 

 left, twenty-five. Internal aspect : a horizontal sec- 

 tion sliows : 1. The renal pelvis with the sinus renalis, 

 the crest, and laterally the arms of the pelvis. 2. Cor- 

 tical, and 3. Medullary layers of the tissue proper. 

 Structure : a fibrous membrane, external envelope ; 

 tissue proper divided into cortical and medullary layer. 

 In the first are found the Malpighian corpuscles, in the 

 latter, the tubuli urinriferi. Blood vessels : renal ar- 

 tery and vein. Lymphatics : numerous. Nerves : from 

 the solar plexus. Development : they appear early in 

 the foetus. 



Ureters. — Form, membranous canals. Origin: the 

 inf undibulium of the pelvis. Termination : obliquely 

 into the bladder, through its muscular coat. Structure : 



