296 THE CIRCULATORY SYSTEM. 
glenoid border as far as the glenovertebral angle, supplying 
the infraspinatus and latissimus dorsi by lateral branches. 
A. thoracicodorsalis (2).—This arises from the subscapular 
a short distance from its origin and passes across the teres 
major to the latissimus dorsi (7), giving branches to both these 
muscles and to the epitrochlearis. 
A. circumflexa humeri posterior.—The posterior circum- 
flex artery arises from the A. subscapularis close to the origin 
of the latter. It passes between the subscapularis muscle and 
the teres major, close to the border of the biceps, then between 
the lateral and long heads of the triceps. It gives off a branch 
to the inner surface of the spinodeltoid and acromiodeltoid, 
then passes distad to supply the lateral and long heads of the 
triceps. 
4. A. brachialis (g’).—The brachial artery is the con- 
tinuation of the axillary (g) into the arm beyond the origin of 
the subscapular (/). It passes along that side of the biceps 
which lies next to the humerus. It passes thus, accompanied 
by the brachial vein (/’) and median and ulnar nerves, through 
the bicipital arch and afterwards between the biceps (4) and 
the intermediate division of the medial head of the triceps to 
the supracondyloid foramen of the humerus, through which 
it passes with the median nerve to reach the concavity of the 
elbow. It gives off the following branches: 
a. A. circumflexa humeri anterior (’).—The anterior cir- 
cumflex artery usually leaves the brachial near its origin (but 
may arise from the subscapular (/) or one of its branches); it 
passes to the biceps (4) near the origin of the latter and sends 
a branch proximad to the head of the humerus. 
6. A. profunda brachii or superior profunda (w).—This 
arises from the first part of the brachial or it may come off from 
one of the branches of the axillary (e.g., the subscapularis). 
It passes along with the radial nerve onto the dorsal side of the 
humerus and supplies the triceps muscle. It also sends 
branches to the epitrochlearis (6) and latissimus dorsi (7). 
c. Rami musculares.—Muscular branches are given off 
near the supracondyloid foramen to the biceps (4), epitro- 
chlearis (6), and brachialis muscles. A nutrient artery leaves 
