202 



INFERIOR EXTREMITY 



M. obturator internus 

 M. piriformis 



anterior part of this head ; the posterior part will be seen in the dissection 

 of the glutreal region. 



The two heads of origin of the rectus femoris join at a 

 right angle, immediately beyond the margin of the acetabulum, 

 and form a strong flattened tendon, which gives place to 

 a fusiform, fleshy belly. The tendon of origin spreads out on 

 the anterior surface of the proximal part of the muscle in the 

 form of an aponeurosis. About three inches proximal to the 

 knee-joint the rectus femoris ends in a strong tendon of 



insertion, which is 

 prolonged for some 

 distance proximally, 

 on its deep surface, 

 in the form of an 

 aponeurosis. As it 

 nears the patella 

 this tendon is 

 joined by the other 

 tendons of the 

 quadriceps, and 

 through the 

 medium of a com- 

 mon tendon finds 

 insertion into the proximal 

 border of that bone. The 

 rectus femoris is supplied 

 by the femoral nerve. 



M. Vastus Lateralis (O.T. 



FIG. 75. Anterior Aspect of Proximal Vastus ExternUS) forms the 

 Portion of Femur with Attachments inent muscu l ar mass On 



of Muscles mapped out. 



the lateral side of the thigh. 



Its surface is covered by a glistening aponeurosis. The 

 descending branch of the lateral circumflex artery constitutes 

 the best guide to its anterior border, and when this margin 

 is raised it will be seen that the muscle lies upon, and is 

 partially blended with, the vastus intermedius. 



The vastus lateralis arises (i) from the proximal part of 

 the linea intertrochanterica ; (2) from the front of the 

 trochanter major, distal to the insertion of the glutaeus 

 minimus ; (3) from the root of the trochanter major below 

 the insertion of the glutaeus medius ; (4) from the lateral part 

 of the glutaeal tuberosity anterior to the insertion of the glutaeus 



M. ilio-psoas 



