77 



(mitral cells), (4) the granular layer, (5) the olfactory tract, (6) 

 the entocinerea, (7) the central cavity (rhinocoele) with its lining 

 endyma. Understand the course of the olfactory impulse from the 

 olfactory nerve fibers to the olfactory tract (leading to other parts of 

 the brain). Remember that in the human brain there is no rhino- 

 coele (in the adult). 



ADRENAL BODY. 



177. Adrenal body. Cat. Assigned for study. Chrome- 

 oxalic ; paraffin. Stained with hematoxylin and picrofuchsin. 



One of the " ductless " glands. In studying this preparation, 

 note (a) the regions, cortex and medulla, () the zones of the cor- 

 tex and their structure, (<:) the structure of the medulla and the 

 number and character of the contained blood vessels. Other duct- 

 less glands studied by you are the thyroid (128), and the thymus 

 (94). Note the diversity in structure and origin of these three 

 glands. 



It should be recognized that the inclusion of the adrenal body 

 with the organs of the central nervous system is a matter of con- 

 venience rather than because it may logically be grouped with them. 

 On an embryological basis, however, it might be placed in the peri- 

 pheral nervous system. The thyroid (128), likewise, should only 

 be grouped with the respiratory organs, in a classification the basis 

 of which is embryology. 



