438 THE ARTERIES OF THE UPPER LTMB. 



Fig. 359. SUPERFICIAL VIEW OP THE ARTERIES OP THE FRONT 

 OP THE ARM, FOREARM AND HAND. (Tiedemann.) 



a, deltoid muscle ; b, biceps ; &', its semilunar fascia ; c, 

 long head of triceps ; c', its inner head ; d, pvonator teres ; 

 e, flexor carpi radialis ; /, palmaris longus ; /', its tendon 

 spreading in the upper part of the palmar fascia, from which, 

 on the inner side, the palmaris brevis muscle is seen arising ; 

 <7, flexor carpi ulnaris ; h, supinator longus ; i, extensor carpi 

 radialis longior ; I, extensor ossis metacarpi pollicis ; m, flexor 

 sublimis digitorum ; 1, on the tendon of the latissimus dorsi, 

 the lower part of the axillary artery continued into the brachial ; 

 2, superior profunda ; 3, inferior profunda ; 4, anastomotic ; 

 5, near the division of the brachial artery into ulnar and radial, 

 indicates the origin of the radial recurrent artery ; 5', lower 

 part of the radial artery, where it gives off the superficial volar, 

 and turns round the wrist ; 6', the lower part of the ulnar 

 artery, near the place where it passes down to form the super- 

 ficial palmar arch ; 7, the superficial volar, which joins it ; 

 8, 8, 8, 8, digital branches of the superficial arch ; 9, radialis 

 indicis ; on the thumb are seen the two branches of the 

 princeps pollicis artery. 



with the posterior circumflex artery ; and another 

 of considerable size descends in the inner head of 

 the triceps, and joins in the anastomoses above the 

 elbow-joint. A medullary branch enters the fora- 

 men on the back of the humerus (p. 93). Much 

 reduced in size as it arrives at the outer side of 

 the humerus, the artery ends by dividing into two 

 branches ; the one of which, much the smaller, 

 passes on with the musculo-spiral nerve through 

 the external intermuscular septum, into the interval 

 between the supinator longus and brachialis anticus 

 muscles, and anastomoses with the recurrent branch 

 of the radial artery ; while the other descends along 

 the back of the external intermuscular septum, 

 and anastomoses behind the outer condyle of the 

 humerus with the posterior interosseous recurrent 

 artery (fig. 367), and across the back of the bone 

 with the inferior profunda and anastomotic arteries 

 (fig. 362). Small twigs are also given to the skin 

 along with the external cutaneous branches of the 

 musculo-spiral nerve. 



2. The inferior profunda artery, of small 

 size, arises from the brachial artery about the 

 middle of the arm, and is directed to the back 

 part of the inner condyle of the humerus. It 

 descends in company with the ulnar nerve, lying 

 behind the internal intermuscular septum on the 

 inner head of the triceps muscle, to which it gives 

 branches, and it ends by anastomosing with the 

 posterior recurrent branch of the ulnar artery, and 

 with the anastomotic branch of the brachial. 



3. The chief medullary artery of the humerus 

 is a small branch given oif by the brachial about 



the middle of the arm, or by one of its collateral branches. It inclines downwards, 

 enters the canal in the humerus near the insertion of the coraco-brachialis muscle, 

 and is distributed in the interior of the bone. 



