ADRENAL (SUPRARENAL GLAND). 147 



are made up of fine interlacing or parallel fibrils of reticulurn 

 which are somewhat coarser than in other organs. 



Parathyroid Gland. 



The parathyroid is a paired gland closely associated with 

 the lateral lobes of the thyroid. It is composed of solid col- 

 umns of epithelium-like cells. These columns are separated 

 by a very vascular connective tissue, and anastomose with one 

 another so as to form a network similar to that found in the 

 suprarenal gland. Masses of lymphoid tissue are frequently 

 found in connection with the parathyroids. 



According to some authors, these bodies represent embry- 

 onic thyroid tissue. Others believe them to be separate organs 

 having a function of their own. If the thyroid be removed 

 and the parathyroids left, the effects of a complete thyroid- 

 ectomy are not obtained. 



6. ADRENAL (SUPRARENAL GLAND). 



This is a small gland situated just anterior to the kidney, 



FIG. 105. 



Z. <iL Z. fane. Z. ret. Medulla JV/H Cbprafo 



Part of a cross-section through the adrenal of a dog. Z. gl. represents the zona 



glomerulosa. :>>. 



often resting upon it. On sectioning, it can be seen with the 

 naked eye to be made up of a cortex and a medulla. The cortex 



