E. V. COWDKY 



The return pathway is quite unknown, but we would expect to find 

 visceral sensory fibers of the spinal ganglion cells running into the cord 

 through the dorsal roots. Elliott (d) believes there is a center controlling 



Center (?) 

 -"N'm. fibers 

 V s- fibers 



Preganglionic v.m. neurone 



sympathetic 

 ganglion 



Postganglionic vra. neurone 



Smooth muscle 

 Epinephrin 

 Suprarenal medulla 

 Intrinsic ganglia, 



,esser splanchnic nerve 

 Greater splanchnic nerve 



Suprarenal cortex 

 Subcapsular plexus 



.Vs. neurone 

 Suprarenal plexus 



Fig. 2. Scheme of the probable innervation of the suprarenal gland ; v. m., visceral 

 motor and v. s., visceral sensory. 



the secretion or discharge of epinephrin somewhere near the bulbar vaso- 

 niotor centers. Others place the center in the subthalamic region. Wher- 

 ever it may be, it probably receives cortical impulses from above and excita- 

 tions f 10111 the body generally, and discharges into the suprarenal as indi- 

 cated ( Fig. 2 ). The stimulation of an afferent nerve, like the great sciatic, 

 is said to bring about secretion of epinephrin (questioned by Stewart and 

 Rogoff (;')), as is also the stimulation of the splanclmics themselves 



