374 



PRACTICAL ANATOMY. 



greater sacro-sciatic ligament, and then cut the latter. You \vill then see the 

 internal pudics all entering Alcock's canal. (Fig. 258.) 



Branches and Course of Internal Pudic Nerve. A branch of the sacral 

 plexus. (Fig. 194.) The nerve escapes from the pelvis by the greater sacro- 

 sciatic foramen, crosses the spine of the ischium, enters the pelvis by the lesser 

 sacro-sciatic foramen (Fig. 226), above the tendon of the obturator internus 

 muscle, traverses a delamination of the obturator fascia, called Alcock's canal, in 



Gluteus uiedius 



Gluteus minimus 



Pyriformis, divided 



into two by the 



great sciatic nerve 



GREAT TROCHANTER 



Obturator ezternus 



Quadratus femoris 



Faacial insertion of 

 gluteus mazimus 



Horizontal fibres of 

 adductor inagnus 



Fleshy insertion of 

 gluteus mazimus 



GREAT SACRO-SCIATIC 

 FORAMEN 



GLUTEAL NERVE 

 SUPPLYING POR- 

 TIONS OF GLU- 

 TEUS MEIHUS 



GHuteus mazimus 



Obturator interims. 

 Below is the infe- 

 rior gemellus. The 

 superior gemellus 

 is absent 



BRANCHES Of-' J\- 

 FER10I! 

 DAL NERVE 



GKEAT SCIATIC NEKVE. 

 Under it, oblique fibres of 

 adductor magnus are seeu 



SMA LL SCI A TIC NER VB 



FIG. 260. DEEP DISSECTION OK THI <;i.> n \\ Kuans. 

 (From a preparation in the Hunterian Museum.) 



the outer wall of the ischio-rectal fossa. It gives off the following branches : 

 (l) The inferior liu'inorrlioidal, which crosses the ischio-rectal fossa and supplies 

 the skin around the anus ; (2) the perinea!, which supplies tin- integument of 

 tlu- scrotum and tin- labia majora, the transversus perin;ei, the accelerator urina/, 

 the erector penis, and the compressor urethne, or deep internal transversus perinaei 

 muscle; (3) the dorsal nerre of the penis, which gives off branches to the skin 

 of the penis, and to the corpus cavernosum. 



