MUSCLES OF THE THIGH, 



383 



Fig. 101.* 



4. Cruralis, 



Arises, fleshy, from between the two trochanters of the os 

 femoris, but nearer the lesser trochanter, and firmly adhering 

 to most of the forepart of the os femoris, and connected to both 

 vasti muscles. 



Inserted, tendinous, into the upper 

 part of the patella, behind the rectus. 



Use. To assist in the extension of 

 the leg. 



N. B. These four muscles before, 

 being inserted into the patella, have 

 the same effect upon the leg as if they 

 were immediately inserted into it by 

 means of the strong tendon, or rather 

 ligament which is sent oft* from the 

 inferior part of the patella to the tibia. 

 Behind are, 



1 . Semitendinosus, 

 Arises, tendinous and fleshy, in com- 

 mon with the long head of the biceps, 

 from the posterior part of the tubero- 

 sity of the os ischium ; and sending 

 down a long roundish tendon, which 

 ends flat, is 



Inserted, into the inside of the ridge 

 of the tibia, a little below its tubercle. 



Use. To bend the leg backwards 

 and a little inwards. 



* The muscles of the posterior femoral and gluteal region. 1. The gluteus 

 medius. 2. The gluteus maximus. 3. The vastus externus covered in by 

 fascia lata. 4. The long head of the biceps. 5. Its short head. 6. The semi- 

 tendinosus. 7. The semi-membranosus. 8. The gracilis. 9. A part of the 

 inner border of the adductor magnus. 10. The edge of the sartorius. 11. The 

 popliteal space. 12. The gastrocnemius muscle: its two heads. The tendon 

 of the biceps forms the outer hamstring ; and the sartorius with the tendons of 

 the gracilis, semi-tendinosus, and semi-membranosus, the inner hamstring 



