228 ELEMENTARY BIOLOGY. [CHAP. 



inside and rather behind the rectus internus 

 major. It arises from the pelvis close to the 

 anus and is inserted into the aponeurosis about 

 the knee-joint. 



. The adductor longus: it is partly superficial 

 along the outer edge of the sartorius. 



77. The vastus internus: a very large muscle on 

 the outer anterior aspect of the thigh; arising 

 from the pelvis close to the hip-joint, it joins, 

 below, two muscles on the back of the thigh 

 (4. a. ft. y), and all end in a tendon which is 

 inserted into the aponeurosis over the front of 

 the os cruris. 



e. Cut across the belly of the sartorius, and turn its 

 ends out of the way ; dissect out the origin and 

 insertion of the adductor longus and the adductor 

 magnus (d. . and ft). 



a. The adductor longus arises from the anterior 

 inferior part of the symphysis of the iliac 

 bones ; by its lower end it joins the adductor 

 magnus. 



ft. The adductor magnus arises from the pelvis, 

 between the origin of the sartorius and that 

 of the rectus internus major. Its fibres are 

 inserted directly (i.e. without the intervention 

 of a specialised tendon) into the inner side of 

 the distal half of the femur. 



3. The deep muscles on the front of the thigh. 



a. Divide and reflect the adductor longus, rectus 

 internus major and rectus internus minor. The 

 following muscles will be displayed : 



