PARENCHYMA. OF THE ADRENALS. 117 



Hedgehog. Processes of these cords sometimes extend into the 



Fig. 159. 



Fig. 159. Vertical section through the medullary substance of the 

 adrenals of the Ox. a, Bloodvessels ; 6, cords or columns of medul- 

 lary cells. 



cortex, so that small masses of medullary substance may even 

 appear upon the surface. 



The cells of the medulla are Very various in form, and 



Fig. 160. 



Fig. 160. Cell column of the medulla ; from the adrenal of the Ox. 



delicate in structure. In Man they are stellate and polygonal ; 

 in the Pig, frequently columnar ; in the Horse and Ox, often 

 scarcely recognizable, a finely granular mass with centric or 

 excentric nuclei appearing in their stead, or columnar and 

 stellate intercommunicating cells may be present in addition. 



