COKACO-BRACHIALIS. 



supinating the radius. When the body is hanging by the hands it 

 will apply the scapula 

 firmly to the Immerus, 

 and will assist in raising 

 the trunk. 



With the arm hang- 

 ing and the radius fixed, 

 the long head will 

 assist the abductors in 

 removing the limb from 

 the side ; and, after 

 the limb is abducted, 

 the short head will aid 

 in restoring it to the 

 pendent position. 



The CORACO-BRACHI- 

 ALIS is partly concealed 

 by the biceps, and 

 extends to the middle 

 of the arm. Its origin 

 is fleshy from the tip 

 of the coracoid pro- 

 cess (fig. 10), and from 

 the tendinous short 

 head of the biceps. Its 

 fibres become tendinous 

 below, and are inserted 

 into a narrow mark 

 on the inner side of 

 the humerus, below 

 the level of the del- 

 toid (fig. 17). Some of 

 the fibres frequently 

 end on an aponeurotic 

 arch, which extends 

 from the upper end of 

 the humerus to the in- 

 sertion of the muscle. 



The upper half of 

 this muscle is beneath 

 the pectoralis major 

 (fig. 20, p. 49) ; and 



and the 

 trunk, 



on humerus. 



Coraco- 

 brachialis 



origin ; 



insertion ; 



FIG. 18. AXILLARY AND BRAOHIAL ARTERIES 

 " ARTERIES"). 



relations ; 



1. Axillary artery 

 and branches. The 

 small branch above the 



figure is the superior 

 inner part projects thoracic, and the larger 



beyond the short head branch close below the 



of the biceps, forming acromio-thoracic. 



a prominence in the 



axilla. Its insertion is 



covered by the brachial 



vessels and the median 



nerve. The coraco-brachialis lies over the subscapular muscle, the 



2. Long thoracic. 



3. Subscapular. 



4. Brachial artery. 



5. Superior profunda 

 branch. 



6 Inferior profunda. 



7. Anastomotic. 



8. Biceps muscle. 



9. Triceps muscle. 

 The median and ulnar 

 nerves are shewn in 

 the arm ; the median 

 is close to the brachial 

 artery. 



