628 



HUMAN ANATOMY. 



Nerve-Supply. — By the anterior ramus of the obturator nerve from the third 

 and fourth lumbar nerves. 



Action. — To adduct, flex, and outwardly rotate the thigh. 



7. Adductor Magnus (Fig. 601). 



Attachments. — The adductor magnus arises from the inferior rami of the 

 pubis and ischium, as far laterally as the base of the tuber ischii. Its anterior fibres 

 are directed laterally and downward to be inserted into nearly the whole length of 

 the inner lip of the linea aspera by a series of tendinous arches which give passage 

 to the perforating branches of the profunda femoris artery on their way to the back 

 of the thigh. Its posterior fibres converge downward to a strong tendon which is 

 inserted into the adductor tubercle on the inner condyle of the femur. 



Nerve-Supply. — By the posterior division of the obturator nerve from the 

 third and fourth lumbar nerves. 



Action. — To adduct the thigh. 



Relations. — The adductor muscles, together with the gracilis, occupy the 

 medial surface of the thigh, intervening between the extensor and flexor muscles. 

 The adductor brevis and adductor longus enter into the formation of the floor of 

 Scarpa's triangle (page 639), and from the apex of the latter the femoral vessels are 



Fig. 602. 



Sacrum 

 Greater sacro-sciatic foramen 



Greater sacro-sciatic ligament 



Lesser sacro-sciatic ligament 

 Lesser sacro-sciatic foramen 



Gemellus superior 



Obturator internus 



Gemellus inferior 



Crest of ilium 



Tuber ischiis 

 Quadratus femoris 



Gluteus minimus 



Pvriformis 



Greater trochanter 



Tendon of obturator externus 



I 



t^. 



Deep dissection of right buttock, showing muscles attached to greater trochanter of femur. 



continued downward upon the longus and magnus close to their insertion, and, 

 together with the internal saphenous nerve, are bridged over by an aponeurotic 

 membrane which passes from the longus and magnus to the surface of the vastus 

 internus. By this membrane the space occupied by the vessels and nerve is con- 

 verted into a closed passage-way termed Hunter' s canal (canalis adductorius) (Fig. 

 606), the lower end of which corresponds to the interval (hiatus tendineus) between 

 the tendons of the anterior and posterior portions of the adductor magnus. 



The perforating branches of the deep femoral artery pierce the adductor magnus 

 near its insertion, the first one passing above and the second below the adductor 

 brevis, or both perforate that muscle also, while the third passes through the magnus 

 a little above the hiatus tendineus. 



