

MUSCLES OF THE THIGH. 



761 



The ylutei are described along with the rotators of the 

 thigh, under the head of muscles of the pelvis, which see. 



The biceps flexor cruris arises by two heads ; the long 

 head by a short tendon, in common with the semi-tendino- 

 sus, from the back part of the tuberosity of the ischium ; 

 the short head comes from the lower FIG. 250. 

 third of the linea aspera and joins the 

 long. A strong tendon is thus formed, 

 constituting the outer hamstring, which 

 goes to be inserted into the head of the 

 fibula. A bursa is seen between this 

 tendon and the external lateral liga- 

 ment. Function. To bend the leg. 



The semi-tendinosus (Fig. 250) arises 

 from the tuberosity of the ischium in 

 common with the long head of the biceps, 

 to which it adheres for three or four 

 inches, becomes large and fleshy, and 

 ends in a round, long tendon, constitut- 

 ing one of the inner hamstring muscles, 

 which goes behind the internal condyle 

 to be inserted into the side of the tibia 

 below its tubercle. Function. To bend 

 the leg. 



Thesemi-membranosus (Fig. 250) arises 

 from the tuberosity of the ischium, at 

 its upper and outer part tendinous, soon forms a mem- 

 branous expansion, and becoming fleshy, ends below in 

 a tendon constituting the other inner hamstring, which 

 passes behind the internal condyle, to be inserted into the 

 back and inner part of the head of the tibia, just below its 

 joint. At this point the tendon sends off a broad aponeu- 

 rosis, covering the back of the joint, and passing beneath 



FIG. 250 represents the Muscles on the Posterior Thigh, a Gluteus medius. 

 6 Gluteus maximus. c Fascia lata. d Long head of the biceps flexor cruris. 

 t Short head of the same muscle. /Semitendinosus. g g Semi-membranosus- 

 h Gracilis. i Adductor magnus. j Sartorius. k Popliteal space. I Gas- 

 trocnemius. 



