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. 



17. 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 /3). 



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. 



/I 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. 



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 : 



