3 22 



THE INFERIOR EXTREMITY 



crosses the tibial collateral ligament of the knee joint, and, 

 becoming flattened, is inserted into the proximal part of the 

 medial surface of the body of the tibia, near the anterior 

 crest of that bone, and immediately distal to the tendon of 

 the gracilis. From its distal border aponeurotic fibres pass 

 into the deep fascia of the leg ; its proximal border is adherent 

 to the gracilis for about half an inch from its insertion, and 

 both tendons are concealed by the expanded insertion of the 

 sartorius. A mucous bursa lies between the three tendons 

 and the tibial collateral ligament of the knee joint. 



Biceps femoris , 



Fibular collateral 

 ligament" 



Extensor digitorum 

 longus 



... Semitendinosus 



FIG. 139. Anterior aspect of Proximal Portions of Bones of Leg with 

 Attachments of Muscles mapped out. 



The muscular belly of the semitendinosus is divided into 

 proximal and distal parts by a very oblique tendinous inter- 

 section, and each part receives a branch from the sciatic 

 nerve. The muscle is a flexor of the knee, a medial rotator 

 of the leg, and an extensor of the hip joint. 



M. Semimembranosus. The semimembranosus muscle 

 arises from the lateral impression on the upper part of the 

 tuberosity of the ischium (Fig. 128, p. 286). The tendon of 

 origin is broad at its attachment to the bone, and narrows as 

 it passes medially anterior to the origin of the biceps femoris; 

 it then expands again, and, passing distally and medially, 

 anterior to the semitendinosus, is folded in such a manner 



