340 



THE GENITOURINARY ORGANS. 



columns, consisting usually of two rows of cells, and situated be- 

 tween the reticular processes, which run at right angles to the cap- 

 sule. The cells of this zone are polyhedral in shape, with gran- 

 ular protoplasm often containing fat droplets and with nuclei 

 containing little chromatin. Similar cells are found in the reticular 

 zone, but here they are found in small groups situated in the meshes 

 of the reticulum. The cells of the medullary substance are less 

 granular and smaller in size than those of the cortex, and are 

 grouped in irregular, round, or oval masses bounded by the septa of 

 reticulum. These cells stain a deep brown with chromic acid and its 



. Zona fasciculate. 



Capsule. 



Zona glomerulosa. 



Zona reticularis. 



Fig. 273. Section of suprarenal cortex of dog ; X 1 2O ' 



salts are therefore known as chromaffin cells ; the color cannot be 

 washed out with water a peculiarity which shows itself even during 

 the development of these elements, and which is possessed by few 

 other types of cells. Numerous ganglion cells, isolated and in 

 groups, and many nerve-fibers occur in this portion of the organ. 



