162 



THE ESSENTIALS OF HISTOLOGY 



the groups are more rounded (zona glomerulosa, b], whilst next to the 

 medulla they have a closely reticular arrangement (zona reticularis, d), 

 and a similar disposition both of the cells and the connective tissue is 

 noticeable throughout the medulla. 



The cells which form the rounded groups and columns of the cortical 

 substance are polyhedral in form (fig. 197) ; each contains a clear round 

 nucleus, and there are often yellowish oil-globules in their protoplasm. 



FIG. 196. YKRTICAL SECTION OP SUPRA 

 RENAL BODY. (Magnified.) 



1, cortical substance ; 2. medullary substance ; 

 , capsule ; b, zona glomerulosa ; c, zona 

 fasciculata ; d, zona reticularis ; e, groups 

 of medullary cells ; /, section of a large vein. 



FIG. 197. CELLS AND CELL-GROUPS 

 FROM THE OUTERMOST LAYER OP 

 THE CORTICAL SUBSTANCE OF THE 

 SUPRARENAL BODY. 



FlG. 198. A SMALL PORTION OF THE 

 MEDULLARY PART OF THE SUPRA- 

 RENAL CAPSULE OF THE OX. 



No blood-vessels penetrate between these cells, both the blood-vessels 

 and lymphatics of the cortex running in the fibrous septa between the 

 columns ; the lymphatics have been stated to communicate with fine 

 spaces which run between the cells of the columns. 



The cells of the medulla (fig. 198) are more irregular in shape, and 

 are often branched. Their protoplasm is either clear, or it may in some 

 animals contain a brownish pigment, but in man the dark red colour of 



