THE CIRCULATION OF THE BLOOD 



influenced by nerve centers in response to nerve impulses transmitted to 

 them in consequence of cerebral (psychic) or physiologic activities in different 

 parts of the body is a matter of personal experience; that the heart is abnor- 

 mally influenced by the same nerve-centers in response to nerve impulses 

 transmitted to them in consequence of pathologic and traumatic processes 

 occurring in different regions of the body, and that both heart and nerves 



Emotional Centers 



Exhilarating (BLUE) 

 depressing freoj 



Cardio -Inhibitor Center. 



Ganglion Stetlatum 



Intra-CardiacHerve Celi 



Cantio -Accelerator Center 



VagusNerve 



ibitor 



(BLUE) 

 (BLUE) 



Sympath etic Mroes ' 



Accelerator &.Augmcntor 



FIG. 137. DIAGRAM OF THE NERVE MECHANISM OF THE HEART. (G. Bachmann.) 



are modified in different ways by the action of drugs introduced into the 

 body, are matters of daily clinical experience. 



The nerves comprising this mechanism and the relation they bear one to 

 another are represented in Fig. 137. 



It was stated in a previous paragraph, page 298, that the contraction of 



