THE ENDOCRINAL ORGANS 



453 



intensifies masculine traits, so that a woman may acquire the beard and 

 deep voice of the male. The " bearded lady " of the side show is a familiar 

 example. 



The endocrine secreted by the medullary tissue of the adrenal is 

 epinephrine or adrenin, its empirical chemical formula being C9H13O3N. 



ENDOCRINE INTERRELATIONS 



POSTERIOR LOBE ^PITRESSIN AND PITOCIN) PANCREATOTROPIC, KETOCENIC, PARATHYREOTROPIC 



4TH DAYOF MENSTRUAL CYCLE 



Fig. 378. — A diagram illustrating the complex interrelations of the endocrine 

 organs. The multiplicity of pituitary influences is only partially indicated. For the 

 sake of clearness the diagram over simplifies the relations. The pancreatropic, keto- 

 genic, and parathyreotropic factors are not thoroughly understood. (Adapted from 

 Therapeutic Notes through courtesy of Parke, Davis & Company.) 



Most commercial adrenin is now made synthetically and not derived as an 

 extract from animal tissue. Like the sympathetic nerves, adrenin has a 

 stimulating effect upon smooth muscle. Since sympathetic nerves and 

 the chromaflEin cells of the medulla have a common origin in the embryo, 

 this similarity of function might be expected. It is so potent a drug that 

 its physiological effects appear even when it is diluted to one part in 

 400,000,000 of blood. 



