HEART 



419 



end causes no effect ; stimulation of the upper end causes 

 (1) slowing of the heart and (2) a marked fall in the 



Fig. 181. — Connections of the Heart with the Central Nervous System. 

 All., auricle; V., ventricle; V.D.C., abdominal vaso-dilator centre; 

 C./.C, cardiac inhibitory centre; G.A.C., cardio-augmentor centre; 

 S.G., superior cardiac branch of the vagus; I.C, inferior cardiac 

 branch of the vagus with cell station in the heart; S., cardio- 

 sympathetic fibres with cell station in the stellate ganglion ; V.D.A6., 

 vaso-dilator fibres to abdominal vessels. The continuous lines are 

 outgoing, the broken lines are ingoing nerves. 



pressure of blood in the arteries, and it may cause pain. 

 The slowing of the heart is a reflex effect through the 



