140 



A NEURAL METAMEKK 



[BOOK i. 



PIG. 24. SCHEME OF THE NERVES OF A SEGMENT OF THE SPINAL CORD. 



Gr grey, W white matter of spinal cord. A anterior, P posterior root. 6' ganglion 

 on the posterior root. N whole nerve, N' spinal nerve proper, end : ng in At skeletal 

 or somatic muscle, S somatic sensory cell or surface, A in other ways. V visceral 

 nerve (white ramus communicans) passing to a ganglion of the sympathetic chain 

 2. and passing on as V' to supply the more distant ganglion a, then as V" to the 

 peripheral ganglion </ and ending in m splanchnic muscle, s splanchnic sensory 

 cell or surface, r other possible splanchnic endings. 



From 2 is given off the revehent nerve r. K (grey ramus communicans), which 

 partly passes backward towards the spinal cord, and partly runs as c. m, in connection 



