302 



ENDOCRINE GLANDS 



Fia. 28. Innervation of the heart. 



This diagram shows to the right the nerve axis, to the left the heart. 



In the axis Pro. means Pons Varoli: Dl and D5 indicate medullary segments located at 

 the extremity of the medullary cardiac zone; S. Indicates the thoracic central ganglionic fibres 

 and the Stellar ganglion. 



On the side of the heart : W indicates the ganglionic plexus of Wrisberg ; A indicates the 

 auricles, Ve the ventricles, Au t. A. V. the auriculo ventricular bundle; V. C. S. and V. C. I. 

 the superior and inferior vena cava; S.V. sinus venosus. 



The nerve connection is therefore as follows: 2 axis centres, one in the bulb, the other in 

 the spinal column and under the control of the higher centres. (V). They are connected with 

 the heart, by means of the vegetative fibres of the vagus for the bulb (interrupted in the 

 plexus of Wrisberg) and by means of the true sympathetic for the cord (interrupted in the 

 stellar ganglion). The autonomic system of the heart is made up of the superior bundle of 

 PI v-r?^' tlie a uricu lar venous fibres 01 Wenckenbach (We), the nodes of Keith and 

 tflack (K. F.) and their auricular connections, the nodes of Aschoff-Tawara (A. T.) continued 

 bv the hiinHlft nf Polnrh'r^-WJo (T> TJ \ A 4.~ j.u~ A_:_I. 



