114 ADRENALS, OR SUPRARENAL CAPSULES, BY C. J. EBERTH. 



differentiated from each other as the whole cortex is from the 

 medulla. In the first-mentioned group, and especially in Man, 

 the outermost layer is clearly distinguishable from the second, 

 but the limit between this and the innermost layer is very 

 faint. 



Both the external and the internal cell masses consist of 

 polygonal and rounded balls of protoplasm containing a single 

 nucleus, and either isolated or collected into groups. In the 

 Ox the innermost layer appears as a tolerably homogeneous 

 infiltration of the stroma with polygonal cells. In some other 

 animals, as in Man and the Rabbit, the several cells appear to 

 have coalesced into a single mass. The external cell masses of 

 the Dog are elongated and horseshoe-shaped structures com- 

 posed of columnar cells. 



The cortical columns consist of elongated cylindrical masses 



Fig. 156. 



Fig. 156. Cells and cell masses of the most external cortical layer of 

 the adrenal of Man. 



of cells. As they lie in successive rows, they give to thick 

 sections of the cortex, when examined with low powers, the 

 appearance of being composed of long parallel bands or 

 columns, as in Man. Just beneath the capsule many of the 

 columns form short communications with each other. In their 

 subsequent course, also, they sometimes appear to anastomose. 



The cellular constituents are the same as in the most 

 external layer, except that in many animals they are con- 

 stantly, and in Man occasionally, infiltrated with larger and 

 smaller fat drops. 



The innermost cells of the internal cortical layer in Man are 

 characterized by their yellowish colour. 



