154 ORIGIN, INSERTION, AND USE 



CORACO HUMERALIS. 



Origin. — By a slender tendon, from the coracoid process 

 of the scapula. 



Insertion. — Into the inner and fore part of the body of the 

 os humeri. 



Use. — To assist in extending the shoulder joint, and 

 turning the humerus inwards. 



FLEXOR BRACHII. 



Origin. — By a strong, round tendon, from the coracoid 

 process of the scapula. 



Insertion. — Tendinous into the inward parts of the head 

 and neck of the radius, where it adheres also to the capsular 

 ligament of the elbow joint : from it an expansion is sent off 

 to the fascia of the arm. 



Use. — To bend the arm by carrying it forwards and 

 upwards. 



HUMERALIS EXTERNUS. 



Origin. — Prom the lower and inner border of the neck 

 and body of the os humeri. 



Insertion. — Into the inner and upper body of the radius. 

 Use. — To bend the arm. 



MUSCLES OF THE ARM. 

 FLEXOR METACARPI EXTERNUS 



Is situated on the outer side of the other superficial rlexos. 



Origin. — From the outer and back part of the external 

 condyle. It has two tendons ; one is fixed in the os trapezi- 

 um ; the other passes on through a tendinous sheath to be 

 inserted into the head of the outer small metacarpal bone. 



Use. — To bend the leg. 



FLEXOR METACARPI MEDIUS 



Passes along the middle and back part of the arm. It 



