120 



THE DUCTLESS GLANDS 



in the adrenal than in the abdominal chromaphil bodies. The 

 blood spaces are wider, and the whole aspect gives the 

 impression that the adrenal medulla is more highly organized 

 [see Fig. 34 (bid. v., col. c.)]. 



Many of the cells of the adrenal medulla are spherical, as in 

 the abdominal chromaphil body, and their'dimensions are the 

 same viz., about 12 // in diameter. The nuclei, also, are of 

 the same order of magnitude in the two cases viz., 5 JJL or 6 /. 

 But in many regions, especially where the cell columns are 



chrom. c. 

 col. c. 



bid. V. 



chrom. c. 



col. c. 



chrom. c. 



Fio. 34. Section through the medulla of the adrenal of a dog, prepared as 



in case of previous figure. Same magnification. 



Lettering same as for Fig. 33. 



separated by large venous sinuses, the cells are arranged in a 

 definitely epithelial fashion round the bloodvessels [Fig. 34 

 (col. c.)]. In this case the cells are columnar in shape, and 

 may reach a length of 26 ^, and the nuclei are placed at the 

 end of the cell remote from the bloodvessel. 



The protoplasm of the adrenal medulla is more distinctly 



granular than that of the abdominal chromaphil body, and 



>is, moreover, more delicate in consistence, and therefore shows 



more shrinkage in fixation and tearing during the process of 



i A utting sections. When the adrenal is fixed in bichromate 





