160 



Spinal Nerves. 



N. GLUTAEU5 

 SUPER. 



N. POPLIT. 

 (N.TIBIAL.POST) 



B. DA5TROGNENI. 



N.SAPHENUS 

 EXTERN. 



EXT. 

 (N. PERON.) 



N. CUTAN. 



SURAE EXT. 



ET MED. 



504. The Great Sciatic Nerve. 



The muscular bran- 

 ches of the anterior cru- 

 ral nerve supply the 

 muscles on the front of 

 the thigh, with the excep- 

 tion of the adductors and 

 gracilis. 



The five sacral 

 nerves, Nervi sacrales, 

 are the largest of the 

 spinal nerves, the coccy- 

 geal nerve, however, the 

 smallest. The posterior 

 divisions of these 

 nerves pass through the 

 posterior sacral foramina 

 and Hiatus sawo-coccygeus, 

 and unite to form the 

 Plexus sacralis posterior , 

 which supplies cutaneous 

 branches to the sacral 

 and coccygeal regions. 

 The large, anterior di- 

 visions pass through the 

 anterior sacral foramina 

 and the Foramen sacro- 

 coccygeum, and form the 

 Plexus sacro-coccyyeus. 



The Plexus sacro-coc- 

 cj/gcus divides into the Ple- 

 xus ischiadicus, pudendalis 

 and coccygciis. The Plexus 

 iscliiadicus and pudendalis 

 are usually classified un- 

 der the name of the sa- 

 cral plexus. The bran- 

 ches of the Plexus iscliia- 

 dicus (of the sacral plexus 

 with the exception of the 

 pudic nerve and its bran- 

 ches) within the pelvis, 

 are muscular filaments 

 suppling the M. pyri- 

 formis and M. obturator 

 inter nus. Outside of the 

 pelvis the branches are 

 following : 



