THE SYMPATHETIC, 87 



it by a communicating branch. From this ganglion 

 the sympathetic cord runs back, crossing the neck of 

 the second rib ; and, in the hollow between this and the 

 third, lies on and adheres to the ganglion of the second 

 dorsal spinal nerve (165). 



215. Thence the trunk continues to the neck of the 

 third rib, and on it divides into an external and larger 

 branch which enters the muscular layer of the lung, 

 and a smaller one, which continues the direction of the 

 main trunk toward the next spinal ganglion, to which 

 it is not directly adherent, but just beyond which it 

 receives a large communicating branch from this gan- 

 glion. 



216. The sympathetic cord, still running posteriorly, 

 divides again into a larger outer division, which runs 

 to the lung musculature, and a smaller inner, which 

 passes by the fourth spinal ganglion and gets a com- 

 municating branch from it, a small ganglion being 

 found at point of union. The common cord thus 

 formed gives a slender outer branch to the lung, and 

 an inner, which runs back and gets a branch from the 

 fifth dorsal spinal ganglion, there being a ganglionic 

 enlargement at the point of junction. 



217. From the last ganglion three branches run 

 back. One (outer) passes to the dorsal aspect of the 

 kidney, running in the peritoneum ; one (internal) 

 enters the tissues about the dorsal aorta ; the median 

 and largest continues the chain back, and passes to- 

 ward the flat surface of the kidney, which lies against 

 the vertebral column. Before reaching this, it gives 



