158 HUMAN ANATOMY. 



SARTORIUS. Origin, from the anterior superior spinous 

 process of the ilium and the upper part of the notch below ; in- 

 serf ion, into the inner and upper part of the shaft of the tibia; 

 action, flexes the leg upon the thigh and the thigh upon the 

 pelvis ; nerve, branches of the anterior crural. 



QUADRICEPS EXTEXSOR. This extensive muscle covers the 

 front and sides of the femur and consists of four portions the 

 rectus femoris, the vastus externus, the vastus internus, and the 

 crureus. 



EECTUS FEMORIS. Origin, by two heads one, the long 

 head, from the groove above the brim of the acetabulum; the 

 other, the short head, from the anterior inferior spinous process 

 of the ilium ; insertion, by the common tendon into the patella ; 

 action, extends the leg upon the thigh; nerves, branches of the 

 anterior crural. 



VASTUS EXTERNUS. Forms the greater part of the quadri- 

 ceps extensor. Origin, by an extensive aponeurosis extending 

 from the tubercle of the femur along the anterior border of the 

 great trochanter and the whole length of the outer lip of the 

 linea aspera; insertion, into the outer portion of the patella, 

 joining the common tendon; action, extends the leg on the 

 thigh; nerves, branches of the anterior crural. 



VASTUS INTERNUS AND CRUREUS. Origin, by a tendinous 

 aponeurosis extending from the neck of the femur throughout 

 the whole length of the inner lip of the linea aspera; insertion, 

 into the common tendon, together with the rectus femoris and 

 the vastus externus; action, extends the leg on the thigh; nerves, 

 branches of the anterior crural. 



SUBCRUREUS. Origin, from the anterior aspect of the lower 

 part of the shaft of the femur; insertion, into the synovial sac 

 behind the patella. 



GRACILIS. Origin, from the inner margin of the ramus of 

 the ischium and the pubes; insertion, into the inner aspect of 

 the shaft of the tibia, below the tuberosity; action, flexes the 

 leg and draws it inward, assisting the sartorius ; nerve, the obtu- 

 rator. 



PECTINEUS. Origin, from the tendinous prolongation of 

 Gimbernat's ligament and the linea ilio-pectinea ; insertion, into 

 the rough line leading to the linea aspera from the lesser tro- 

 chanter; action, adducts the thigh; nerves, obturator, the ac- 

 cessory obturator, and branches of the* anterior crural. . 



ADDUCTOR LONGUS. 0n#w, from the front of the os pubis 

 below the crest; insertion, into the middle third of the linea 

 aspera, between the adductor magnus and the vastus internus; 

 action, adducts the thigh; nerve, obturator. 



