l\ 



s. v. a 



in 



Diagrammatic representation of the course of cardiac augmentor fibers 

 in the frog (Foster): V.r., roots of vagus (and ninth) nerve; G.V '., ganglion 

 of same; Cr., line of cranial wall; Vg. t vagus trunk; IX, ninth, glosso- 

 pharyngeal nerve; S.V.C., superior vena cava; Sy., sympathetic nerve 

 in neck; Or.c., junction of sympathetic ganglion with vagus ganglion send- 

 ing i.e., intra cranial fibers, passing to Gasserian ganglion. The rest of the 

 fibers pass along the vagus trunk. Or 1 , splanchnic ganglion connected with 

 the first spinal nerve; Or 11 , splanchnic ganglion of the second spinal nerve; 

 An.V. t annulus of Vieussens; A.sb., subclavian artery; Or 111 , splanchnic 

 ganglion of the third spinal nerve; ///, third spinal nerve; r.c.. ramus 

 communicans. 



The course of the augmentor fibers is shown by the thick black line. 

 They may be traced from the spinal cord by the anterior root of the third 

 spinal nerve, through the ramus communicans to the corresponding splanch- 

 nic ganglion Or 111 , and thence by the second ganglion Or 11 , the annulus of 

 Vieussens, and the first ganglion G 1 , to the cervical sympathetic Sy, and 

 so by the vagus trunk to the superior vena cava S.V.C. 



