406 



THE MUSCULAK SYSTEM. 



the middle third of the thigh, the 

 roof of adductor canal (Hunter's). 

 The ilio-psoas, passing into the 

 thigh beneath the inguinal liga- 

 ment, assists, along with the 

 pectineus and adductor muscles, 

 in forming the floor of the femoral 

 triangle. 



M. Sartorius. The sartor- 

 ius, a long strap-like muscle, arises 

 from the superior anterior spine 

 of the ilium and half of the margin 

 of the notch below it (Fig. 360). 



It passes distally in the thigh, 

 across the medial side of the knee, 

 and is inserted, by aponeurotic 

 fibres, into the medial surface of 

 the body of the tibia just distal 

 to the medial condyle, and by 

 its borders into fascial expansions 

 which join the capsule and the 

 tibial collateral ligament of the 

 knee-joint, and the fascia lata of 

 the leg (Fig. 363, p. 408). 



The sartorius is superficial in 

 its whole extent. Its proximal 

 third forms the lateral boundary 

 of the femoral triangle ; its middle 

 third forms the roof of the ad- 

 ductor canal ; and its distal third, 

 in contact with the medial side of 

 the knee, is separated from the 

 tendon of the gracilis muscle by 

 the saphenous nerve and the 

 saphenous branch of the arteria 

 genu suprema. A bursa lies be- 

 neath the tendon at its insertion. 



Nerve -Supply. The sartorius is 

 supplied by two sets of nerves associated 

 with the two intermediate cutaneous 

 branches of the femoral nerve (L. 2. 3.). 

 Actions. The sartorius, " the 

 tailor's muscle," is a flexor of the hip 

 RECTUS FEMORIS and knee joints. It also everts the 

 thigh and assists in medial rotation of 

 the tibia. 



M. Quadriceps Femoris. 

 The quadriceps femoris is com- 

 posed of four muscles the rectus 

 femoris, vastus lateralis, vastus 

 intermedius, and vastus medialis. 

 The rectus femoris is super- 

 ficial except at its origin, which 

 is covered by the glutsei, sartorius, 

 and tensor fasciae latse muscles. 

 The vasti lie on either side of 

 the rectus muscle, the vastus 

 lateralis being partially concealed 

 by the tensor fascise latse and ilio-tibial tract, the vastus medialis by the sartorius 



ILIACUS 



PSOAS MAJOR 



TENSOR FASCIA 



LAT^E 



PECTINEUS 



ADDUCTOR 

 LONGUS . 



SARTORIUS 



-Ilio-tibial tract 

 .GRACILIS 



ADDUCTOR 

 MAGNUS 



VASTUS 

 LATERALIS 



RECTUS FEMORIS 



VASTUS 

 MEDIALIS 



TENDON OF 



LlGAMENTUM 

 PATELLAE 



FIG. 360. THE MUSCLES OF THE ANTERIOR ASPECT OF 

 THE EIGHT THIGH. 



