RADIAL ARTERY. 



turns round the outer border of the wrist, Fig. 277. 



and descends to the back of the space be- 

 tween the metacarpal bones of the thumb 

 and fore finger : there it passes forwards 

 into the palm of the hand, and crosses to- 

 wards the inner side, so as to form the 

 deeper palmar arch. In consequence of the 

 changes in its course, the direction and 

 connections of the radial artery may be 

 separately described in the forearm, on the 

 wrist, and in the hand. 



Fig. 277. DEEP ANTERIOR VIEW ofl THE AR- 

 TERIES OP THE ARM, FOREARM, AND HAND 

 (from Tiedemann). \ 



The biceps brachii, the pronator teres and mus- 

 cles rising from the inner condyle, the supinator 

 longus, the lower part of the flexor longus pol- 

 licis and flexor profundus digitorum, the anterior 

 annular ligament of the carpus and the muscles 

 of the ball of the thumb, have been removed ; n, 

 pronator quadratus muscle ; 1, lower part of 

 the axillary artery continued into the brachial ; 

 2, superior profunda branch ; 3, inferior pro- 

 fund a ; 4, anastomotic ; 5, upper part of the radial 

 artery and radial recurrent ; 5', lower part of the 

 radial artery, giving oif the superficialis voice 

 branch; 5", the radial artery emerging from be- 

 tween the heads of the abductor indicis muscle ; 

 6, 6, the upper part of the ulnar artery with the 

 anterior and posterior ulnar recurrent branches ; 

 6', the ulnar artery approaching the wrist and 

 descending into the superficial palmar arch which 

 has been cut short ; 6", the deep branch of the 

 ulnar artery uniting with the deep palmar arch ; 

 7 (marked only on one), three interosseous branches 

 from the deep palmar arch joining the palmar 

 digital arteries 8, 8, 8, which have been cut away 

 from their origin from the superficial arch to near 

 their division into the collateral digital arteries ; 

 the ulnar collateral of the little finger is represented 

 as rising in this instance from the deep ulnar ar- 

 tery ; 9, placed between the princeps pollicis and 

 radialis indicis branches of the radial artery ; 10, 

 lower part of the anterior interosseous artery f 



passing behind the pronator quadratus muscle ; 11, 5~j 



anastomosis of the anterior carpal branches of the 

 radial and ulnar arteries with recurrent branches 

 from the deep palmar arch. 



395 



In the forearm the radial artery, com- 

 mencing at the point of bifurcation of the 

 brachial opposite the neck of the radius, 

 descends at first somewhat obliquely out 

 wards in a line with the brachial artery, 

 and then nearly vertically along the outer 

 part of the front of the forearm to the 

 fctyloid process of the radius. Its course 

 may be indicated by a line drawn from 



D D 2 



