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 trunk through the foramen, immediately after 



FIG. 1109. 



Ext. cutaneous nerve 



Ant. sup. spine of ilium 



Ant. crural nerve 



Br. to rectus 



Sartorius 



Artie, br. of accessory obturator 

 Iliacus 



Br. to vastus ext. and crureus 

 Rectus 



Middle cutaneous nerve 



Int. cutaneous, ant. branch 



Femoral artery 



Int. cutaneous, post, branch 



Int. sapheiious nerve 

 Nerve to vastus interims 



Rectus 



Artie, br. from nerve 

 to vastus int. 



'Ext. iliac artery 



Int. iliac artery 

 Accessory obturator nerve 



Obturator nerve 



Pectineus 



Obturator nerve, ant. division 



Adductor longus, cut 

 Obturator nerve, post division 

 Articular br. to hip-ioint 

 Adductor brevis 



Pectineus 

 Adductor magnus 



Adductor brevis 



Gracilis 

 Adductor longus 



Terminal br. ant. division obturator nerve 



Cutaneous branch 



Br. from int. cutaneous to subsartorial plexus 



Artie, br. to knee-joint from obturator 

 nr. to subsartorial plexus and femoral 

 artery 



Cutaneous br. to inner surface 



Internal saphenous nerve 



Cutaneous patellar br. int. saohenous 



Sartorius, insertion 



Post. br. int. cutaneous 

 Internal saphenous 



Dissection of right thign, 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 :ato the 

 substance of the muscle. 



