552 



THE DUCTLESS GLANDS ENDOCRIN GLANDS 



of white fibrous tissue among which are many elastic fibers. The stroma 

 of the medulla is also richly supplied with elastic tissue. 



The epithelium of the zona glomerulosais arranged in spheroidal 

 groups or in hooked or slightly coiled columns which are continuous 

 with the straight columns of the fascicular zone. The cells of the zona 

 glomerulosa are closely packed within the connective tissue meshes and 



tfSE 



''* If- ' ' * * * * <"' * 



*: 





FIG. 480. MORE HIGHLY MAGNIFIED REGION OF THE PRECEDING SECTION, TO 

 SHOW THE CAPSULE (C), ZONA GLOMERULOSA (G), AND A PORTION OF THE ZONA 

 FASCICULATA (F). 



the cell outlines are very indistinct. Wherever their outlines can be 

 readily distinguished the cells are seen to be of columnar shape and are 

 arranged in slender columns whose cells are often grouped about an 

 indistinct central lumen. The cytoplasm of the cells of this zone is 

 finely granular and stains readily with acid dyes. Occasional minute fat 

 droplets appear in the innermost cells of the group, but these are never 

 so abundant as in the more internal portions of the cortex. The nuclei 

 in this zone are spheroidal in shape and rich in chromatin ; they present 

 frequent mitoses (Canalis, 1877), but these are more abundant in early 

 life than in the adult. 



The cells of the zona fasciculata are highly characteristic. They 



