208 PRACTICAL ANATOMY. 



BRACHIALIS ANTICUS. 



Origin Anterior surface of lower half of humerus. 



Insertion Base of coracoid process of ulna. 



Nerves External cutaneus and musculo-spiral. 

 TRICEPS. 



Origin Three heads, long head from lower part of 

 glenoid cavity, middle head from posterior surface 

 of humerus above musculo-spiral groove, short 

 head from posterior surface of humerus below 

 musculo-spiral groove. 



Insertion Olecranon process of ulna. 



Nerve Musculo-spiral. 



SUBANCONEUS. 



Origin Posterior surface of lower part of humerus, 



beneath the triceps. 



Insertion Posterior ligament of elbow-joint. 

 Nerve Musculo-spiral. 



ANTERIOR MUSCLES OF THE FOREARM. 



Superficial Layer. 



PRONATOR RADII TERES. 



Origin Two heads, first from internal epicondyle, 

 second from coronoid process of ulna. 



Insertion Outer side of radius, about its middle. 



Nerve Median . 

 FLEXOR CARPI RADIALIS. 



Origin Internal epicondyle. 



Insertion Base of metacarpal of index finger. 



Nerve Median . 

 PALMARIS LONGUS. 



Origin Internal epicondyle. 



Insertion Passes downward in front of annular liga- 

 ment, and expands into the deep palmar fascia. 



Nerve Median . 



