XI] 



ORGANS OF INTERNAL SECRETION 



145 



for some of the symptoms can be induced by the excessive ad- 

 ministration of thyroid extract. The most obvious symptom is 

 the protrusion of the eye-ball, tliis being accompanied by rapid 

 and irregular cardiac action, nervous excitation, and an increased 

 metabolism . 



The Suprarenal Bodies. These bodies are situated one on 

 each side just in front of the kidney. Accessor}^ suprarenals 





Fig. 71. Section through suprarenal glanJ of dog (after 

 Bohnand Davidoft' from Schafer). 



are not uncommon. Each gland has a capsule of connective 

 tissue giving off strands into the interior, a yellow cortex con- 

 sisting of i)arallel rows of cells, the long axis of each row or column 

 being at right angles to the surface, and a dark red medulla con- 

 sisting of a mass of irregularlv arranged cells with blood vessels. 



