958 



NEUROLOGY 



through the greater sciatic foramen, below the Piriformis, and runs down in front of 

 the sciatic nerve, the Gemelli, and the tendon of the Obturator internus, and enters 

 the anterior surfaces of the muscles; it gives an articular branch to the hip-joint. 





Superior gluteal 



Inferior gluteal 



To Piriformis 



Sciatic 



Common 

 peroneal 



Tibia! 



To Quadratus femoris and 



Inferior gemellus 

 To Obturator internus and 

 Superior gemettus 



Post. fern, cutaneous 

 Perforating cutaneous 



5lh Sacral 



Coccygeal 



Pudendal 



To Levator ani, Coccygeus and 

 Sphincter ani externus 



Fid. 828. Plan of sacral and pudendal plexuses. 



The Nerve to the Obturator Internus and Gemellus Superior arises from the ventral 

 divisions of the fifth lumbar and first and second sacral nerves. It leaves the pelvis 

 through the greater sciatic foramen below the Piriformis, and gives off the branch 

 to the Gemellus superior, which enters the upper part of the posterior surface of 

 the muscle. It then crosses the ischial spine, reenters the pelvis through the 

 lesser sciatic foramen, and pierces the pelvic surface of the Obturator internus. 



