THE INTERNAL FEMORAL REGION 



becomes flattened, and is inserted into the upper part of the inner surface of the 



shaft of the tibia, below the tuberosity. A few of the fibres of the lower part of 



the tendon are prolonged into the deep 



fascia of the leg. The tendon of this 



muscle is situated immediately above that 



of the Semitendinosus, and its upper edge is 



overlapped by the tendon of the Sartorius, 



with which it is in part blended. As it 



passes across the internal lateral ligament 



of the knee-joint it is separated from it by 



a synovial bursa (hursa anserina) common to 



it and the Semitendinosus muscle. 



Relations. By its superficial surface, with the 

 fascia lata and the Sartorius below; the internal 

 .saphenous vein crosses it obliquely near its lower 

 part, lying superficial to the fascia lata; the internal 

 saphenous nerve emerges between its tendon and 

 that of the Sartorius; by its deep surface, with the 

 Adductor brevis and the Adductor magnus and 

 the internal lateral ligament of the knee-joint. 



The Pectineus (m. pectineus) (Fig. 381) 

 is a flat, quadrangular muscle, situated at 

 the anterior part of the upper and inner 

 aspect of the thigh. It arises from thejlio- 

 pecfineal line, and to a slight extent from 

 the surface of the hone in front of it between 

 the pectineal eminence and spine of the os 

 pubis, and from the fascia covering the 

 anterior surface of the muscle; the fibres 

 pass downward, backward, and outward, to 

 be inserted into a rough line leading from 

 the lesser trochanter to the linea aspera. 



Relations. By its superficial surface, with the 

 pubic portion of the fascia lata, which separates it 

 from the femoral vessels and internal saphenous 

 vein; by its deep surface, with the capsular liga- 

 ment of the hip-joint, the Adductor brevis and 

 Obturator externus muscles, the obturator vessels 

 and nerve being interposed; by its outer border, 

 with the Psoas, a cellular interval separating them, 

 through which pass the internal circumflex vessels; 

 by its inner border, with the margin of the Adductor 

 bngus. There is usually a bursa (bursa m. pectinei} 

 between the Pectineus and the tendon of the Psoas 

 and Iliacus. 



The Adductor longUS (m. adductor lonyus) 

 (Figs. 381 and 385), the most superficial 

 of the three Adductors, is a flat triangular 

 muscle lying on the same plane as the 



Pectineus. It arises, by a flat narrow ten- 



don, from the front of the os pubis. at the FlG - 385 -~ Dee P musc ^ i( ^ the internal femoral 

 angle of junction of the crest with the sym- 



phvsis; and soon expands into a broad fleshy belly, which, passing downward, 

 backward, and outward, is inserted, bv an aponeurosis. into the linea aspera. 



