THE LOWER EXTREMITIES. 



191 



side of the thigh and its tendon, which embraces the 

 external lateral ligament of the knee-joint, forms the 

 outer hamstring. On the inner side are the semitendi- 

 nosus and the semim.embranosus muscles. These rise 



FIG. 75. 



FIG. 76. 



FIG. 77. 



FIG. 75. Superficial muscles of hip and thigh (from behind): 1, Gluteus me- 

 dius; 2, gluteus maximus; 3, vastus externus; 4, biceps flexor cruris; 5, semiten- 

 dinosus; 6, semimembranpsus ;7, gracilis; 8, sartorius; 9, adductor magnus; 10, 

 11, gastrocnemius; 12, origin of plantaris. (Borland's Dictionary.) 



FIG. 76. Muscles of the inner side of thigh and interior of pelvis: 1, 

 Iliacus; 2, psoas magnus; 3, obturator internus; 4, pyriformis 1 ; 5, erector spinse; 

 6, gluteus maximus; 7, sartorius; 8, adductor longus; 9, gracilis; 10, adductor 

 magnus; 11, semimembranosus; 12, semitendinosus; 13, rectus femoris; 14, vas- 

 tus internus. (Borland's Dictionary.) 



FIG. 77. Superficial muscles of front of thigh: 1, Insertion of external oblique 

 into iliac crest: 2, aponeurosis of external oblique; 3, external abdominal ring; 

 4, gluteus medius; 5, tensor vaginae formoris; 6, sartorius; 7, iliopsoas; 8, pecti- 

 neus; 9, adductor longus; 10, gracilis; 11, adductor magnus; 12, vastus exter- 

 mus; 13, rectus femoris; 14, vastus internus; 15, biceps flexor cruris. (Dorland'a 

 Dictionary.) 



from the tuberosity of the ischium and are inserted, 

 the one into the upper inner surface of the shaft of the 

 tibia and the other into the internal tuberosity of the 

 tibia. Their tendons form the inner hamstring. Like 

 the biceps they serve to extend the thigh and flex the 



