PARENCHYMA OF THE ADRENALS. 



113 



may be distinguished. In the latter case there is an external 

 and internal layer of rounded cell masses or clusters (paren- 



Fig. 155. 



Fig. 155. Vertical section through the adrenal of Man. 1, cortex ; 

 2, medulla ; a, capsule ; 6, layer of outer cell masses ; c, layer of cell 

 columns (Zona fasciculata) ; d, layer of the internal cell masses ; e, 

 medullary substance ; /, section of a vein. 



chymatous bodies), separated by a layer of cylindrical columns 

 of cells (cortical cylinders, cortical columns). This arrange- 

 ment is found in Man, the Pig, Dog, Hedgehog, and Guinea-pig. 



In other animals, as the Ox, Horse, Cat, Rabbit, and Mouse, 

 the outer layer of cell masses is absent, the cortical columns 

 coming into direct contact with the investing capsule, and 

 being continuous below with the internal cell masses. 



These several laminae, however, are by no means so sharply 



VOL. II. I 



