THE LUMBAR PLEXUS. 



1325 



a. The branch to the obturator externus arises within the pelvis from the inner surface of 

 the obturator nerve. It accompanies the parent trunlc through the foramen, immediately after 



£xi. cutaneous nerve 



Ant. sup. spine of ilium 



Ant. crural nerve 



Br. to rectus 



Sartorius 



Artie, br. of accessory obturator 



Iliacu.s 



Br. to vastus ext. and crureus . 

 Rectus. 



Middle cutaneous nerve - 



Int. cutaneous, ant. branch - 



Femoral artery- 



Int. cutaneous, post, branch - 



Int. saphenous nerve 

 jServe to vastus internus 



Rectus 



Artie, br. from nerve 

 to vastus int. 



Ext. iliac artery 



Int. iliac artery 

 Accessory obturator nerve 



Obturator nerve 



Pectineus 



Obturator ner-^'c, ant division 



Adductor longus, cut 



obturator nerve, post division 



Articular br. to hip-ioint 



Adductor brevis 



Pectineus 

 Adductor magnus 



Adductor brevis 



Gracilis fF 



Adductor longus 



Terminal br. ant. division obturator nerve 



Cutaneous branch 



Br. from int. cutaneous to subsartorial plexus 



Artie, br. to knee-joint from obturator 



Br. to subsartorial plexus and femoral 



artery 



il_ Cutaneous br. to inner surface 

 of thigh and knee 



Internal saphenous nerve 



Cutaneous patellar br. int. saohenous 



Sartorius, insertion 



Post. br. int. cutaneous 

 Internal saphenous 



Dissection of right thigii, showing branches of anterior crural and obturator nerves, 

 escaping from which it dips down in the interval between the obturator membrane and the obtur- 

 ator externus muscle. From this situation its fibres pass through the deep surface into the 

 substance of the muscle. * • 



