384 PROF. M. WATSON AND DR. A. H. YOUNG ON 



upper three fourths of the external surface of the shaft of the femur. 

 The muscle is inserted along with the rectus femoris. 



Vastus Internus takes its origin from the anterior intertrochanteric 

 line, from the upper half of the internal surface of the shaft of the femur, 

 and from the upper three fourths of the anterior surface of that bone. 

 The fibres blend with those of the preceding muscle, and are inserted along 

 with those of the next muscle. 



Rectus Femoris arises from the inferior border of the iliac bone im- 

 mediately in front of the acetabulum. Its fleshy fibres pass downwards, 

 and terminate in a tendon common to it and the two preceding muscles. 

 This tendon is inserted into the anterior tubercle of the tibia, it receives 

 on its outer side some of the fibres of the long vastus, and on its inner 

 those of the long adductor of the leg. 



Internal Femoral JRegion. 



Short Adductor of the Leg {Gracilis). — Has an extensive origin from 

 the lower surface of the pubic bone close to the symphysis, and from a 

 median tendinous band which separates it from the opposite muscle. This 

 band extends back as far as the anus. The muscle is inserted by means of 

 a broad aponeurotic tendon, the upper half of which is attached to the 

 inner border of the tibia, whilst the lower half unites with the fascia cover- 

 ing the inner head of the gastrocnemius. 



Pectineus arises from the inferior border of the pubis close to the gra- 

 cilis. It passes downwards, and winds round the middle of the femur to 

 be inserted into the posterior border of the shaft of that bone. 



Adductor Femoris arises from the outer surface of the body of the 

 pubis, between the origins of the pectineus and semi-membranosus, and is 

 inserted into the posterior border of the femur, its insertion corresponding 

 to that of the pectineus, but extending a little further down. 



Posterior Femoral Eegion. 



Semi-membranosus arises from the external surface of the pubic arch, 

 its origin extending from the posterior extremity of the symphysis to the 

 tuberosity of the ischium. Its insertion is into the lower third of the in- 

 ternal condyloid line of the femur, into the internal lateral ligament of the 

 knee-joint, and into the internal tuberosity of the tibia. 



Semitendinosus. — This muscle arises, together with the vastus longus, 

 fi'om a special tubercle of the ischium below the tuberosity of that bone, 

 as well as from the tuberosity itself, and from the upper border of the 

 ischium. The fibres form a thick fleshy mass, which lies parallel to the 

 posterior border of the vastus longus, and is inserted beneath the gracilis 

 into the inner border of the upper part of the shaft of the tibia, and also 

 into the fascia covering the gastrocnemius. 



