MUSCLES OF THE THIGH. 443 



sartorius. It is a complete penniform muscle, fleshy in front, 

 for the most part, but faced behind with tendon. It arises from 

 the anterior inferior spinous process of the ilium by a round 

 tendon, which is joined by another tendon, coming from the 

 superior margin of the acetabulum. 



It is inserted into the superior surface of the patella by a 

 strong tendon, and intermediately by the ligamentum patellae 

 into the tubercle of the tibia. 



Its extends the leg. 



The Vastus Exlernus, 



Is a very large muscle on the outside of the thigh ; it arises, 

 tendinous and fleshy, from the upper part of the os fernoris, im- 

 mediately below the trochanter major. Its origin commences 

 in front, and passes obliquely around the bone to the linea as- 

 pera. It continues afterwards to arise from the whole length of 

 the linea aspera, and from the upper half of the line running 

 from it to the external condyle. 



Its fibres pass inwards and downwards, and are inserted, by 

 a flat tendon, into the external edge of the tendon of the rectus, 

 and also into the external upper part of the patella. This mus- 

 cle has a broad tendinous surface exteriorly and above; at its 

 lower part it has a tendinous facing on the side next to the bone. 



It also extends the leg. 



The Vastus Internus, 



Covers the whole inside of the os femoris. It arises, by a 

 pointed fleshy origin, in front of the os femoris, just on a level 

 with the trochanter minor, tendinous and fleshy from the whole 

 length of the internal edge of the linea aspera, and from the line 

 leading from it to the internal condyle. 



Its fibres descend obliquely, and are inserted by a flat tendon 

 into the internal edge of the tendon of the rectus, and into the 

 upper internal edge of the patella. 



It also extends the leg. 



