THE URINARY ORGANS. 



255 



Numerous ganglion cells are present and many nerve 

 fibers. . 



Blood-vessels. Each suprarenal gland receives 

 three arteries, one each from the aorta, the phrenic, 

 and the renal. The arteries break up into small 

 branches, most of which enter the medulla through 

 the hilum. Some branches ramify in the capsule 



Zona glomerulosa. 



Cortex. ^ 



- Zona fasckulata. 



Zona reticularis. 



Medulla. *J 



Fig. 195. Section of suprarenal gland of dog. 



and from there enter the cortex, where they form 

 capillaries around the columns of epithelial cells. 

 Those that enter the medulla form a coarse plexus 

 in this part, and then send smaller capillaries into the 

 cortex to anastomose with those from the capsule. 

 The veins pass out from the center, usually one from 



