Left Ant Caval vein .Right Ant Caval vein 



Preganqf ionic rrettrdn 



^ l ionic neuron 



'Auricular sfeptum 

 Position 



vonBezold's Ganqlion 

 in Auricular septum 



In f Vena 



Hook from 

 'Heart lever 



didders Gdnqlion 

 in auriculo-ventricular junction 



Simulating electrodes 

 c . . . , . in sino-auricu/ar 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 creseentic line where they will stimulate some postganglionic 

 libers. (From Jackson.) 



