HAMSTRING MUSCLES 



same time lifts it in such a way that when both legs are acted 

 upon together, they'' are flexed and crossed, hence the name, 

 signifying "tailor" muscle. 

 Nerve. Femoral. 



The tensor fasciae latae. Is attached 

 to the anterior part of the crest of the 

 ilium between two layers of the fascia lata; 

 it makes tense the lateral portion of the 

 fascia which is connected with the tibia, 

 or the ilio-tibial band. (This is felt like 

 a strong cord above the lateral epicon- 

 dyle.) It also rotates the thigh inward 

 (Fig. 91). 



Nerve. Superior gluteal. 



MUSCLES OF THE THIGH 



Posterior 



The muscles are three in num- 

 ber the biceps femoris, semitendi- 

 nosus, and semimembranosus (Fig. 



93). 



The biceps femoris. Origin. 

 Long head on the tuber of j the is- 

 chium, short head on the linea as- 

 pera (lateral lip). Insertion. The 

 head of the fibula. 



The semitendinosus and the 

 semimembranosus also arise on 

 the tuber of the ischium, and are 

 inserted on the tibia, medial sur- 

 face and back of head. (Their 

 names indicate their shape, one 

 being tendinous in half its length, Xf 2> 3> ^ IliacuS( psoas> ^ 



and the Other aponeuro tic, or mem- tor, piriformis; 5, gluteus maximus; 

 i \ 6, sartorius; 7, gracilis; 8, semitendin- 



branous .) 



Action.' These three muscles 

 act together to flex the knee. 



Nerve to the three. Sciatic. 



Notes. They also assist the gluteus maximus to extend the 

 thigh, as in rising from a chair. The biceps tendon may be felt 

 8 



FIG. 92. MEDIAL ASPECT OF THE 

 THIGH AND PELVIS. 



osus; 9, semimembranosus; 10, n, 

 12, tendons of sartorius, gracilis, and 

 semitendinosus; 14, tendon of semi- 

 membranosus. (Sappey.) 



