SUPRARENAL CAPSULES. 



433 



The three layers of the cortex are an external one, or zona 

 glomerulosa ; a middle one, or zona fasciculata ; and an in- 

 ternal one, or zona retlcularis. 



The external layer consists of rounded or oval groups of 

 cells, separated by delicate connective-tissue trabeculse, which 

 spring from the capsule. Similar cells are found throughout 

 the entire cortex. They have been called the parenchymatous 

 bodies or cells, although a better name is cortex corpuscles. 

 In structure they resemble ordinary cells, consisting of poly- 



FIG. 186. Horizontal section through the outermost cortical portions of the suprarenal capsule of the 

 Horse, a, blind termination of a cylinder ; ft, groove-shaped and cylindrical cortical trabeculae ; c, stroma. 

 Eberth. 



hedral masses of protoplasm furnished with spherical nuclei 

 and conspicuous nucleoli. Their protoplasm has a coarsely 

 granular character, and, as a rule, contains more or less fat in 

 greater or smaller droplets. 



The middle layer contains cortical corpuscles which are ar- 

 ranged in almost parallel rows, and are so closely packed that 

 this portion acquires a distinctly striated appearance. These 

 cellular columns have received various names. By Ecker they 

 were called gland tubules, Kolliker termed them cortical cylin- 



28 



