Medulla 



oblongata 

 N.XI 



Cervical I 



Accessory n. 

 to trapezu 



Spinal 

 medulla 

 (cord) 



Kami 



communican- 

 tes going to 

 Symp. gang, 

 (preganglionic) 

 Ansa \ 

 subcldvia- 

 (Annulus of 

 Vieussens), 4 



Thoracic -3 

 nerves ^ 



N.I 



Postganglionic fibers 



are dotted thus 



Jugular ganglion (Gang, of the root) 

 Depressor (Fall in pressure or slowing of heart.) 

 \! \ (Sensory) Separate nerve in rabbit and opossum. 



Nodosum ganglion (Gang, of the trunk) * Hunt * 



Harrington) 



-Inhibitory cranial autonomic fibers 

 ^Superior cervical ganglion 

 -Descending sympathetic fibers in cord 

 ^.Cervical vago- sympathetic trunk 



Electrodes (slowing or stoppage of 

 5ubdavian heart. Augmentation in some 



animals.) 

 Aortic arch 



First thoracic qanqlion 

 (Stellate) 



Electrodes 

 (Acceleration, or 



augmentation of heart.) 



Fig. 70. Schematic representation of the innervation of the heart of the mammal. The red 

 continuous lines represent the sympathetic (accelerator) preganglionic fibers, and the broken red 

 lines, their postganglionic fibers. The cell stations are in the inferior cervical and stellate ganglia, 

 some extending up to the superior cervical ganglion. The green continuous lines represent the 

 vagus preganglionic fibers, and the broken green lines, their postganglionic fibers. The cell stations 

 in this case are located in the heart itself. It will be observed that electrodes applied to the so- 

 called vagus low down in the neck may stimulate some sympathetic fibers. (From Jackson.) 



