1 68 Mufcles of [Book IX, 



which covers and confines the mufcles of the thigh, 

 Its ufe is to ftretch and fupport the fafcia, and alfo to 

 roll the thigh fomewhat inwards. 



On the fore-part of the thigh are, 



The rectus, which arifes partly from the inferior and 

 anterior fpinous procefs of the ileum, and partly from 

 the dorfum of the ileum, a little above the acetabulum. 

 Palling down the middle of the os femoris it is inferted 

 into the patella, by the intervention of which its effect, 

 that of extending the leg, is much increafed. 



The v'aftus externus arifes from the root of the tro- 

 chanter major, and the outer edge of the linea afpera. 

 through its whole length. It is inferted partly into the 

 upper and outer part of the patella, and partly into the 

 tendinous expanfion, which is" continued from the out- 

 fide of the thigh to that of the leg. This mufcle aflifts 

 the former in extending the leg. 



The vaftus internus arifes from the fore part of the 

 os femoris, the root of the trochanter minor, -and inner 

 edge of the linea afpera. It terminates partly in the 

 tendinous aponeurofis of the leg, and is partly inferted 

 into the inner and upper part of the patella. It alfo 

 extends the leg. 



The crurasus arifes from the anterior part of the 

 os femoris, between the two trochanters, but nearer 

 the trochanter minor. It adheres firmly to the whole 

 of the anterior part of the os femoris, is inferted into 

 the middle of the patella, and afiifts in extending the 

 leg. 



On the pofterior part of the thigh are placed 



The femitendinofus, which arifes from the tubcro- 

 fity of the os ifchium, and is inferted into the infide of 

 the ridge of the tibia a little below its tubercle. Its 

 effect is to bend the leg and draw it inwards. 



The femimembranofus, which originates from the 



tuberofitv 



