ANATOMY, EMBRYOLOGY AND HISTOLOGY 



69 



Zona fasiculata 



(6) Pigment and Mitochondria. Pigment is of common occurrence, 

 particularly in the zoiui roticularis. Mulon(e) has found that there are 

 tvpical mitochondria between the granules of pigment and lipoid. 



(c) Reticular Apparatus. Pensa has discovered a dense, well defined 

 cytoplasmic network, which he believes to be similar to the reticular ap- 

 paratus described by Golgi and his students in many other cells. Holm- 

 gren has also described a 

 network of clear canals, 

 called trophospongium, 

 within the cells, which is 

 believed by some to be 

 similar to the reticular 

 apparatus of Golgi. Thus 

 far, however, no experi- 

 mental results have been 

 recorded making use of the 

 Golgi apparatus as an indi- 

 cator of cell activity and 

 cell injury. No trace of 

 the apparatus can be seen 

 in living cells teased out in 

 salt solution. 



(2) Dark Cells. The 

 dark cells stain intensely 

 with iron hematoxylin and 

 have for this reason been 

 called "siderophil." They 

 also contain granules stain- 

 able with Sudan III. 

 Mulon(e) thinks that the 

 mitochondria have all 

 gone into solution, which 

 explains the uniform col- 

 oration of the cells with 

 mitochondrial dyes. It is 

 difficult to say whether 

 Pensa observed the reticu- 

 lar apparatus in these cells 

 or not. 



(3) Relation Between 



Light and Dark Cells. The relationship of these two cell types (light 

 and dark) is under active discussion. All stages in transition between 

 them may be distinguished. Both of them possess attraction spheres. It 

 is uncertain whether they represent different phases of functional activity 



Zoiia reiicularis 



Medulla 



Fig. 6. Section of a human suprarenal gland 

 showing the capsule, glomerular, fasicular and reticu- 

 lar zones and medulla (magnification 110). 



