248 



INFERIOR EXTREMITY 



the head, but the posterior slip gives an aponeurotic extension 

 to the fascia of the leg, whilst the anterior part gives off a 

 slip (in some cases strong, but generally feeble) to the 

 adjacent part of the lateral condyle of the tibia. 



M. Semitendinosus. This muscle arises from the medial 

 impression on the proximal part of the tuberosity of the 

 ischium by a tendon common to it and the long head of the 

 biceps femoris, and also by fleshy fibres directly from the 

 bone (Fig. 74, p. 200). A narrow, tendinous intersection 

 appears on the posterior surface of the muscle about the 



M. biceps femoris 

 Lig. collat. fibulare 



M. sartorius 

 M. gracilis 



M. semitendinosus 



FIG. 92. Anterior aspect of Proximal Portions of Bones of Leg with 

 Attachments of Muscles mapped out. 



middle of the thigh, and is directed obliquely distally and 

 laterally. The muscular belly ends, in the distal third of the 

 thigh, in a long cylindrical tendon which passes distally 

 on the semimembranosus muscle. On the medial side of the 

 knee the tendon bends anteriorly, 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 immedi- 

 ately 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 



