158 



Spinal Nerves. 



If. ILEO- 



HYPDGASTR. 



(R. ILIAC.) 



502. The Cutaneous 

 Nerves at the Poste- 

 rior Surface of the 

 Lower Extremity. 



3. Ge nit o- crural, N. genito- 

 cruralis, mixed nerve, arises from 

 the second lumbar nerve, and 

 divides into two branches, the 

 genital or external sper- 

 matic, N. pudend. s. spermaticus 

 externus, which descends along 

 the back of the spermatic cord, 

 and supplies the M. cremaster and 

 Tunica dartos ; and the crural 

 or 1 u m b o - i n g u i n a 1, N. lumbo- 

 ingumaUs, to the skin of the thigh. 



4. External cutaneous, 

 N. cutaneus femoris anterior externus, 

 from the second and third lum- 

 bar nerves, pierces the Fascia lata 

 beneath the anterior superior 

 spine of the ilium and sends 

 branches to the outer side of the 

 thigh as far down as the knee. 



5. Obturator, N. obtura- 

 torius, from the second, third and 

 fourth lumbar nerves , passes 

 through the obturator foramen, 

 supplies the M. obturator externus, 

 and divides into an a n t e r i o r 

 and a posterior branch. 

 The posterior bra n c h goes 

 to the J\L obturator externus and 

 M. adductor magnus ; the a n t e- 

 r i o r branch to the M. yracilis, 

 ]\L adductor lonyus and brevis, pier- 

 ces the Fascia lata, and sends 

 filaments along the inner surface 

 of the thigh, as far down as the 

 knee-joint. 



