BKACH1AL ARTERIES. 



421 



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muscles; the latter lies between the 

 pectoralis anticus and levator humeri, 

 terminating in the pectoral muscles. 



The EXTERNAL THORACIC or MAM- 

 MARY artery arises close to" the inferior 

 cervical, turns round the anterior 

 border of the first rib, and passes 

 along the internal aspect of the pec- 

 toralis magnus and parvus, a small 

 branch accompanying the spur vein, 

 and ramifying in the panniculus. 



The PRESCAPULAR artery arises 

 from the brachial, in front of the 

 tendon of the subscapularis, passing 

 between it and the antea-spinatus ; 

 it is accompanied by a vein and 

 nerve to the dorsum scapulae, supply- 

 ing the shoulder joint, pectoralis 

 parvus, scapular muscles, and flexor 

 brachii tendon. 



The SUBSCAPULAR artery arises at 

 right angles from the brachial, just 

 before it becomes the humeral, near 

 the interstice separating the subscapu- 

 laris and teres internus muscles. It 

 passes up the inner side of the caput 

 magnum, and terminates at the dor- 

 sal angle of the scapula, supplying 

 branches to the latissimus dorsi, scapu- 

 lar, and lateral thoracic muscles ; also 

 the nutrient scapular, and the 

 BoapuLo-hwmearalj or posterior cir- 

 cumflex artery, which passes outwards 

 behind the shoulder joint, under the 

 caput magnum and postea-spiuatus, 

 terminating in the external muscles 

 of the region. 



When the brachial artery reaches 

 the humerus it assumes the name of 

 the humeral artery, just as the exter- 

 nal iliac becomes the femoral as it passes the pelvic brim. 



FIG. 162. 



Arteries of the anterior limb viewed 

 from inside. 1, Brachial ; 2, Humeral ; 

 3, Anterior radial ; 4, Posterior radial ; 



5, Recurrent radial ; 6, Radio-palmar ; 

 7, Large metacarpal ; a, Prescapular ; 



6, Subscapular ; b', Branch to Ia:i3.5i- 

 U1U3 dorsi ; 6", Posterior circumflex ; 

 V", Scapular nutrient and muscular 

 branch ; 6"", Main branch supplying 

 the muscles ; c. Anterior circumflex ; 

 d, Humeralis prof unda ; e, Cubital ; 

 '. Xutrient artery of hunierns , e", 

 Branch to inferior brachial glands ; 

 e'", Descending branch forming supe- 

 rior carpal arch ; e"", Anterior sub- 

 cutaneous ; /, Interosseous ; /', Branch 

 to the carpus ; g, Muscular branches. 



