578 A MANUAL OF ANA TOMY. 



Insertion. At the upper third of the shaft of the femur, 

 into the inner lip of the linea aspera and the line extending 

 upward to the lesser trochanter. 



Nerve Supply. From the anterior division of the obtu- 

 rator nerve. 



Action. To adduct and rotate the thigh outward ; also, 

 a slight flexor of the thigh. 



Adductor Magnus. Figs. 119,1 20. 



Origin. From the front of the rami of the pubes and 

 ischium, and from the lower part of the tuberosity of the 

 ischium. 



Insertion. Into the back of the femur internal to the 

 insertion of the gluteus maximus, along the whole length 

 of the linea aspera between the adductor brevis, adductor 

 longus, and vastus internus on the inside, and the short 

 head of the biceps on the outside, into the internal condy- 

 loid ridge and ending in a strong tendon, which is attached 

 to the adductor tubercle on the internal condyle of the femur. 



Nerve Supply. The obturator through its posterior divi- 

 sion, and the great sciatic which gives a branch to the pos- 

 terior surface of the muscle. 



Action. To adduct the thigh, to rotate it outward (the 

 upper part of the muscle) ; and to extend the thigh 

 (through the fibres arising from the ischial tuberosity). 



The femoral opening 1 in the adductor magnus muscle. 

 This is a gap that is left along the insertion of the muscle 

 at the middle and lower thirds of the thigh through which 

 the femoral artery and vein pass to enter the popliteal space. 



Besides the opening for the femoral artery and vein the 

 adductor magnus muscle is perforated along its insertion 

 close to the bone by the branches (three) of the profunda 

 which pass to the back of the thigh. 



