FIG. 12 



Scheme of the nerves of a seg- 

 ment of the spinal cord (Foster) : N~ 

 Gr., gray; W, white matter of 

 spinal cord; A, anterior; P, pos- 

 terior root; G, ganglion on the 

 posterior root; N t whole nerve; 

 N', spinal nerve proper, ending 

 in M, skeletal or somatic muscle ; 

 S somatic sensory cell or surface ; 

 X, in other ways; V, visceral 

 nerve (white ramus communi- 

 cans) passing to a ganglion of the 

 sympathetic 'chain 2, and pass- 

 ing on as V to supply the more 

 distant ganglion a, then as V" to 

 the peripheral ganglion a' and 

 ending in in, splanchnic muscle ; 

 s, splanchnic sensory cell or sur- 

 face; x, other possible splanchnic 

 endings. From 2 is given off 

 the revehent nerve r.v. (gray 

 ramus communicans) , which 

 partly passes backward toward 

 the spinal cord, and partly runs 

 as v.m. in connection with the 

 spinal nerve, to supply vaso- 

 motor (constrictor) fibers to the 

 muscles (m r ) of bloodvessels in 

 certain parts, for example, in the 

 limbs; Sy, the sympathetic chain 

 uniting the ganglia of the series 

 2. The terminations of the other 

 nerves arising from 2, c } a' are 

 not shown. 



