60 



TOPOGRAPHICAL ANATOMY OF THE 



cutaneous nerve of the thigh and obturator nerves, and contribute fibres 

 to the cranial gluteal and sciatic nerves. 



The size of the ventral branches of the thoracic and lumbar nerves 



Dorsal ramus. Spinal nerve. 



Ventral ramus. ,^ 

 Grey ramus communicans. j 



White ramus communicans. 



\^\ Efferent ramus. 

 \\\ - 



fe- - Sympathetic ganglion. 



Cord of sympathetic. 



Fig. 25.— Scheme of the sympathetic cord and its connections with 

 the spinal nerves (after Thane). 



varies greatly. That of the first thoracic is large : that of the second 

 is smaller. The rest of the thoracic rami are fairly uniform in size ; but 

 from the first to the last lumbar there is a gradual increase in size. If 

 any general statement were permissible it would be, that those ventral 



