118 



TOPOGRAPHICAL ANATOMY OP 



the back of the thigh in company with, and immediately anterior to, 

 the tibial nerve. Arriving at the gastrocnemius muscle, the two nerves 

 part company, the peroneal running over the lateral head of the 

 gastrocnemius, under cover of the biceps, to reach the region of the 



M. glutfcus.medius. 



Mm. gemelli. 



M. obturator interims. 



.-4¥ M. obturator externus. 



M. iliopsoas. 



M. vastus medialis. 



.M. biceps femoris. 



M. quadratus femoris. 

 M. pectineus. 



M. adductor. 



•M gastrocneinius (caput mediate). 

 Mm. adductor et semimembranosus. 



Lig. collaterale tibiale. 



Fig. 77. — Medial Aspect of the Femur, with Areas of Muscular and 

 Ligamentous Attachment. 



head of the fibula, where it divides into the superficial and deep 

 peroneal nerves. 



The collateral branches of the common peroneal nerve are three 

 in number. (1) A small nerve to the biceps muscle. (2) A small 

 filament (occasionally absent) that arises about the middle of the 

 thigh and joins the posterior cutaneous sural nerve. (3) The anterior 

 cutaneous sural nerve (n. cutaneus surae anterior (lateralis)), which, 

 dividing into two or three branches, pierces the distal part of the biceps 

 and is distributed to the skin of the lateral surface of the leg. 



