356 



VETERINARY PHYSIOLOGY 



muscles as glycogen (p. 352), or it may accumulate in the 

 blood and be excreted in the urine. This latter condition 

 is seen when large doses of adrenalin, the active principle 

 of the medullary part of the suprarenal bodies (p. 5 93), is 

 injected subcutaneously. This substance has a specitic 

 action on the termination of the true sympathetics, and, in 

 all probability, it acts upon the termination of the splanchnic 

 nerves in the liver to increase the conversion of glycogen to 



Brain 



Spinal Cord 



Fig. 160. — To show the various waj's in which glycosuria may 

 be produced (see text). 



glucose. Ergotoxin, which checks its action elsewhere 

 (p. 592), also hmits its power of causing glycosuria (fig. 160). 

 3. The condition is also caused, if the liver is rich in 

 glycogen, by puncturing the posterior part of the floor of the 

 fourth ventricle of the brain. Since this effect is not 

 produced after the suprarenals have been removed, it has 

 been concluded that it is due to a stimulation of these 

 structures through the splanchnic nerves by which an 

 increased outpouring of adrenalin is induced. This might 



