DISSECTION OF THE DOG 81 



N. FEMOEALis.— Piercing the ilio-psoas and the tendons of the abdominal 

 muscles, the femoral nerve enters the thigh between the femoral artery and 

 the ilio-psoas muscle. At once the saphenous nerve and the nerve to the 

 sartorius leave the main trunk. The former has been followed down the thigh 

 m company with the saphenous artery. The nerve to the sartorius follows the 

 lateral circumflex artery. 



m. glvtosus medius 



m. glutisus supeTficiaH3\ 



n. ctUaneus femoris posterior ' 



m, semimembranosus 



m. semitendinosus 



^^a. circum/Cexa ilium profunda. 



n. cufaneus femoris lateralis 

 m. sartorius 



m. tensor fascue tatae 



-m. biceps femoris 



Fig. 31. — Superficial dissection of the gluteal region and thigh. 



The femoral nerve accompanies the anterior femoral artery into the gap 

 between the origins of the medial vastus and rectus femoris muscles, to which 

 and to the lateral vastus it is distributed. 



A. FEMORIS POSTERIOR. — The posterior femoral artery, the last collateral 

 branch of the femoral artery, takes origin on a level with the medial head of 

 the gastrocnemius muscle. Branches from it supply the semitendinosus, biceps, 

 gastrocnemius, and the neighbouring flexor muscles of the digits. 



