VISCERAL ANATOMY. 143 



FlG. 24. SUPERIOR AND GENERAL VIEW OF THE GENITO-URINARY APPARATUS IN 

 THE MALE, WITH THE ARTERIES. 



A, Left kidney; B, Right kidney; a, b, Ureters; c, c, Supra-renal capsules; D, Blad- 

 der; E, E, Testicles; e, Head of the epididymis; ^ Tail of the epididymis; F, Def- 

 erent canal; G, Pelvic dilatation of the deferent canal; H, Left vesicula seminales; 

 the right has been removed, along with the deferent canal of the same side to 

 show the insertion of the ureters into the bladder; i, Prostate; j, Cowper's 

 glands; K, Membranous, or intra-pelvic portion of the urethral canal; L, Its 

 bulbous portion; M, Cavernous body of the penis; m, m, Its roots; N, Head of the 

 penis, i, Abdominal aorta; 2, 2, Arteries (renal) giving off the principal capsular 

 artery; 3, Spermatic artery; 4, Common origin of the umbilical and arteries of 

 the bulb; 5, Umbilical artery; 6, Its vesical branch; 7, Internal artery of the 

 bulb; 8, Its vesico-prostatic branch. 



Malpighian Bodies. 



These are small, round vesicles found in the cortex, lined with 

 cylindrical epithelium, and containing a tuft of blood vessels (the 

 glomerulus), also covered by epithelium. There are two open- 

 ings, one, the beginning of the uriniferous tubule, the other 

 opposite it, showing the entrance of a small artery and the emer- 

 gence of a vein, which afterward forms a plexus around the tube. 



Uriniferous Tubes. 



These are small canals running through the medullary structure 

 of the viscus, beginning at the Malpighian corpuscle, and ending 

 on the ridge of the pelvis. They are first single, but soon subdi- 

 vide into straight tubules, then descend into the medulla as the 

 loop of Henle, in a U shape, turn on themselves and run back to 

 the cortex. Then dilating, have several bends, pass down again 

 through the medulla, narrow and empty on the ridge of the pelvis, 

 as the convoluted tube. 



Structure. 



Amorphous basement membrane covered with flattened, pol- 

 ygonal or polyhedral epithelium in different localities. 



Vessels. 



The renal artery divides into several which give off branches to 

 cortex and medulla, glomeruli and tubes. 



The branches to the medulla descend between the tubes. 



The veins of the capsule are collected in a stellate manner, the 

 stars of Verheyen. They also form arches at the junction of the 

 cortex and medulla, and finally uniting form the renal vein. 



The nerves are from the solar plexus. 



