GLUTEAL REGION 



297 



inferior gluteal artery, under cover of the glutseus maximus. 

 From the inferior border of the glutaeus maximus it proceeds 

 distally, on the back of the thigh, immediately subjacent to 

 the deep fascia. It will afterwards be traced to the posterior 

 aspect of the calf of the leg. 



In the gluteal region it gives off several cutaneous branches, 



LIV 



LV 



To piriformis 



To piriformis 



,, Lumbo-sacral trunk 



Superior gluteal nerve 



Inferior gluteal nerve 



Nerve to quadratus femoris 

 Nerve to obturator internus 



Sciatic nerve 



.Common 



roneal nerve 



'Sciatic nerve 



X Tibial nerve 



Post. cut. N. of thigh (O. T. small sciatic) 

 Perineal N. and dorsal N. of penis \ Pudendal 

 Inferior haemorrlioidal nerve / nerve 



Perforating cutaneous nerve 



-Y ' 



Nerves to levator ani 

 Coccygeal branches 



FIG. 131. Diagram of Sacral Plexus. 



viz. (i) inferior nerves of the buttock, which wind round 

 the inferior border of the glutaeus maximus to supply a 

 limited area of the skin of the buttock; (2) a few twigs to 

 the skin to the medial region of the thigh ; and (3) the 

 perineal branches, of which one is known as the long perineal 

 nerve (O.T. long pudendal). This branch turns medially, round 

 the origin of the hamstring muscles, to reach the perineum. 



