The Thigh. 327 



to the linea aspera and into the linea aspera and the upper 

 part of its inner bifurcation, while those fibres from the 

 tuberosity of ischium are inserted, by a rounded tendon, 

 into the adductor tubercle on the inner condyle of femur. 

 Action. It is the most powerful of the adductors and 

 hence it flexes, adducts and rotates the thigh outwards, 

 whereas, that portion from the^ tuberosity of the ischium 

 slightly extends the femur and rotates it inwards. 



The gracilis, from the anterior surface of the body and 

 descending ramus of the pubes, i.e., from about the middle 

 of the symphysis down to the junction of the rami of the 

 pubes and ischium ; into the inner surface of the tibia be- 

 low its tuberosity, between the insertions of the sartorius 

 and the semi-tendinosus. Action. To adduct the thigh 

 and flex the knee. 



The obturator externus, from the inner half o*f the an- 

 terior surface of the obturator membrane, from a portion 

 of the descending ramus of the pubes and the ascending 

 ramus of the ischium ; into the digital fossa on the inner 

 surface of the great trochanter. Action. To adduct and 

 rotate outwards the thigh. 



The Hamstring Muscles. Biceps, from the inner and 

 posterior facet of the ischial tuberosity by the long head, 

 and from the outer lip of the linea aspera from the inser- 

 tion of the gluteus maximus above, to within two inches 

 of the external condyle below, by the short head. This 

 muscle is inserted into the outer surface of the head of 

 the fibula, sending expansions to the outer tuberosity of 

 the tibia and the deep fascia of the leg. Action. It ex- 

 tends the thigh and flexes the knee ; acting from below, it 

 raises the body from the stooping posture. 



The semi-tendinosus, from the inner and posterior facet 

 of the tuberosity of the ischium ; into the upper part of the 

 inner surface of the tibia, below and behind the insertion 



