414 



THE MUSCULAE SYSTEM. 



portion of the superficial surface of the obturator membrane (Figs. 366 p 412 

 and 367, p. 413). 



Its fibres converge towards the greater trochanter, and end in a stout tendon 



which, after passing distal to 

 and posterior to the hip-joint, 

 sacro-tuber- is inserted into the trochan- 

 ment ga " teric fossa of the greater tro- 

 ^Axmus 8 chanter of the femur (Figs. 

 OBTURATOR 365, p. 410, and 373, p. 417). 



"INTERN us 

 BICEPS AND 



...-SEMITENDIN- 



SEMIMEM- 

 BRANOSUS 

 QUADRATUS 



FEMORIS 



Nerve-Supply. The deep part 

 of the obturator nerve (L. 3. 4.). 



Actions. This muscle is mainly 

 a lateral rotator of the thigh ; it 

 also flexes and addticts it. 



ADDUCTOR 

 MAGNUS 



Trigonum Femorale. 

 The femoral triangle (O.T. 

 Scarpa's triangle) is a large 

 triangular space on the front 

 of the thigh in its proximal 

 third, which contains the 

 femoral vessels in the proximal 

 part of their course and the 

 femoral nerve. It is bounded 

 above by the inguinal liga- 

 ment, laterally by the sartorius, 

 Fascia lata and medially by the medial border of 

 the adductor longus muscle. Its floor 

 is formed laterally by the ilio-psoas, and 

 medially by the pectineus, adductor 

 longus, and a small part of the adductor 

 brevis. 



Canalis Adductorius Hunteri. 

 The adductor canal (O.T. Hunter's 

 BICEPS canal) lies in the middle third of the 

 -(short head) me( ji a i g^e of the thigh, and contains the 

 femoral vessels in the distal part of their 

 course. It is bounded superficially by the 

 sartorius, under which is a dense fascia 

 -(longhead) derived from the fascia lata, binding to- 

 gether the vastus medialis, which forms 

 the lateral wall of the canal, and the 

 adductors, longus and magnus, which form 

 the medial wall or floor of the canal. Be- 

 sides the femoral vessels and their sheath, 

 the canal contains the saphenous nerve. 



-GRACILIS 



SEMIMEM- 

 BRANOSUS 



THE MUSCLES OF THE 

 BUTTOCK. 



This group includes the three glutaei 

 muscles, the tensor fasciae latse, piriformis, 

 obturator internus and gemelli, and quad- 1 

 ratus femoris. 



The glutseus maxinius and tensor fasciae 

 latse muscles are in the same plane, invested by envelopes of the fascia lata. 

 The glutaeus medius, partially covered' by the glutseus maximus, conceals the glutasusl 

 minimus ; while the piriformis, obturator internus, gemelli, and quadratus femoris I 

 intervene between the glutaeus maximus and the posterior surface of the hip-joint, j 



FIG. 368. DEEP MUSCLES ON THE POSTERIOR 

 ASPECT OF THE RIGHT THIGH. 



