THE MUSCULAE SYSTEM. 



205 



The semitencUnosus is a flat ribbon-like muscle whicli arises 

 from' the transverse processes of the anterior caudal vertebrse, 

 and is inserted by a fiat tendon into the inner side of the upper 

 part of the tibia. An accessory muscle may join it, after arising 

 from the femur, to end upon the surface of the back of the 

 crus. 



The semimembranosus is another rihbon-like muscle which 

 runs parallel to but beneath the semitendinosus. It arises from 

 the outer side of the ischium and is inserted, with the tendon of 

 the semitendinosus, into the inner side of the head of the tibia 

 by a flat tendon. 



■Fig. ]60, 



tarso-metafarsu* 



Flexoe Tendons of a Passeeine BrsD. 



The tendon of the flexor longus halhicis crosses superficially to that of 

 the flexor profundus digitorum, and then goes to the hallux. The last- 

 named muscle exclusively suppUes the other three digits. 



The femora-caudal is a long muscle which springs from the 

 transverse processes of the hinder caudal vertebrae and is in- 

 serted onto the posterior surface of the femur — ^into its inferior 

 trochanter when there is such a process. 



A muscle accessory to this may arise from behind the aceta- 

 bulum to join in part the tendon of the femoro-caudal and in 

 part to be itself inserted into the femur. 



