EXTERNAL FEMORAL REGION. 239 



ADDUCTOR LONGUS. 

 (S'uhjnfbio-femoralis Posterior. ) 



(Fici. 70. h.) 



Situated on the inner aspect of the thigh, covered by the 

 gracilis, this muscle is long, flat, and prismatic, extending outwards 

 and downwards. 



Origin. — From the inferior surface of the posterior part of the 

 pubis. 



Insertion. — By two divisions, one attached by the insertion of 

 the brevis, the other, with the magnus, above the internal condyle 

 of the femur at the attachment of the lateral ligament. 



Relation. — Anteriorly with the brevis and obturator externus ; 

 posteriorly with the magnus ; externally with the gracilis ; inter- 

 nally with the ischio-femoralis and sciatic nerves. The femoral 

 vessels pass between its two divisions. 



Action. — To adduct the femur, and rotate it outwards. 



ADDUCTOR MAGNUS. 



(^Sejnimembrauosns — Tsrhio-tibialis.) 

 (Fig. 7C. /.) 



Placed behind the preceding, on the postero-internal part of the 

 thigh, this muscle is thin at its extremities and posterior border, 

 thick and fleshy elsewhere, terminating in a short tendon. 



Origin, — Chiefly fi^om the inferior surface and tuberosity' of 

 the ischium by tendinous fibres, and by a slender band from the 

 coccygeal fascia. 



Insertion. — To a small roughened surface on tlie inner side 

 of the internal condyle of the femur. 



Relation. — Anteriorly with the longus, to which it is very 

 adherent ; externally with the gracilis ; posteriorly with the biceps 

 rotator tibialis ; internally with the triceps abductor. 



Action. — To adduct and extend the thigh. If the limb be 

 fixed, it assists in raising the anterior parts of the trunk in 

 " rearing." 



External Femoral Region. 



abductors. 



This region contains only one muscle, which is situated laterally 

 with respect to the haunch, but more posteriorly with regard to 

 the femur. 



