344 



]\Iuscles of the Leg. 



.M. biceps femoiis 

 (caput longiim) 



M. biceps femoris 

 caput breve) 



M. semimembi'aiiosus 



'J'endo ui. bieipitis femoris 

 M. gastrocnemius - 



-Tractus iliotibialis 

 piaissiati] 



31. vastus lateralis 



- Patella 



Ligameut\im 

 (ollaterale fibulare. 



Capitulum fibulae 



Tuberositas tibiae 



-M. soleus 



389. IVIuscles of the right knee, 



viewed from the lateral surface. 

 (The fascia lata with the exception of the tiactus iliotibialis has beeu removed.) 



M. biceps femoris (see also Figs. 384 387). Form: triangular-prismatic, long with 

 two heads. Position: on the posterior surface of the thigh, chiefly superficial, covered only 

 above by the ni. glutaeus maximus: bounded niedianward by the mm. scmitendinosus and 

 semimembranosus, lateralward by the m. vastus lateralis, in front by the mm. quadratus femoris 

 and adductor magiius. Origin: caput lompim: by a short, strong tendon from the tuber 

 ischiadicum , in connnon with the m. scmitendinosus (bursa m. bicijiitis fcinoris superior see 

 Fig. 3S(i and p. 343); the tendon is continued on the medial surilice tif the muscle as lar as 

 its inferior half: from it muscle fibers run out lateralward and downward to a tendon which 

 b(>gins on the lateral surface in the upper half of the muscle: caput brcoe: fleshy, from the 

 labium laterale of the linen aspera femoris: the fibers go backward and downward to the tendon 

 of tlie caput longum. Insertion: the lowermost, common part extends downward behind the 

 epicondylus lateralis femoris (b. bici}ntorjastrocnemialis see Fig. 3'J3) and goes by a strong, 

 rounded tendon to the capitulum fibulae: in so doing it spans the lig. coUaterale fibulare from 

 l>ehiud and lateralward by two limbs (bursa m. bieipitis femoris inferior see Figs. 390 and 3911. 

 Action: it extends the thigh backward and rotates it outward: it flexes the leg and rotates it 

 outward. Innervation: caput loiujuni: n. tibialis: caput breve: n. peronaeus communis. 



