Left Ant: Caval vein .Riqht Ant Caval vein 



neuron 



's nJf-f- Preganq/ionlc rreurOn 



' 



*ning from 

 Sinus to auricle JILPosition of 



/// Auriculo -ventricular 



*. ^^ I// valves 



Ho ok from 

 'Heart lever 



In/ 1 Vena cava- 



vonBezold's Ganglion 

 in Auricular septum 



'Bidder's GanQlion 

 in 



iders Ganglion 



in auriculo-ventricular junction 



Stimulating electrodes 



in sino-auricular junction [Crescent] 



Sympathetic fibres- dotted lines 



Fig. 68. Diagram to show the innervation of the heart in the frog or turtle. The electrodes 

 are represented as applied to the white crescentic line where they will stimulate some postganglionic 

 fibers. (From Jackson.) 



