218 PRACTICAL ANATOMY. 



Insertion Folds n round the outer surface of the shaft 

 of femur, becomes aponeurotic, and is strongly at- 

 tached to the tendon of the rectus femoris. 



Nerve Anterior crural. 

 VASTUS INTERNUS. 



Origin Internal lip of linea aspera for its whole 

 length, and shaft of femur. 



Insertion Folds around the inner side of femur, and is 

 strongly attached to the tendon of the rectus femoris. 



Nerve Anterior crural. 

 CRUREUS. 



Origin Anterior surface of femur between origin of 

 the vasti. 



Insertion Into the tendon of the rectus femoris. 



Nerve Anterior crural. 



SUBCRUREUS. 



Origin 'Rudimentary, beneath the crureus from the 

 shaft of femur (often absent). 



Insertion Tendon of crureus. 



Nerve Anterior crural. 



The rectus, vasti, and crureus are four muscles which 

 have a single tendon of insertion, on the patella. Coming 

 from such an extensive area of origin, the muscle (quadri- 

 ceps extensor femoris), considered as a whole, is one of 

 great power, sufficient, under certain conditions, even to 

 fracture the patella. The tendon is broad and flat and 

 incloses the patella, the greater mass of the tendinous 

 fibres passing over the anterior surface of the bone, to be 

 inserted on the tuberosity of the tibia. 

 GRACILIS. 



Origin Anterior surface of ramus of pubes and 

 ischium. 



Insertion Upper inner surface of head of tibia. 



Nerve Obturator. 



