921 



Biceps 



RTHE ULNAE AETEEY. 

 elations Of the third part. The third part of the radial artery passes volarwards, 

 Between the two heads of the first dorsal interosseous muscle, to reach the palm, where it 

 ;urns ulnarwards, deep to the proximal oblique part of the adductor muscle of the thumb, 

 ind, after passing through the proximal 

 ibres of the transverse part of the 

 idductor pollicis, or between the ad- 

 acent borders of the oblique and trans- 

 Verse parts of that muscle, it unites 

 vith the deep branch of the ulnar 

 irtery, completing the deep volar 

 palmar) arch. 



Branches of the third part. 



1) The princeps pollicis branch is 



;iven off as soon as the radial artery. 



inters the palm. It runs distally, on 



he volar aspect of the first metacarpal 



,x>ne, between the adductor and the 



>pponens pollicis, and under cover of the 



ong flexor tendon, and divides, near the 



listal end of the bone, into collateral 



tranches which run along the sides of 



;he thumb and anastomose with the 



, lorsales pollicis arteries. 



(2) The arteria volaris indicis radi- 

 ilis is a branch which runs distally 

 )etween the ulnar head of the first dorsal 

 nterosseous muscle and the adductor of 

 ;he thumb and along the radial side of 

 ;he index-finger to its tip. It supplies 

 ;he adjacent tissues, and not uncommonly 

 t anastomoses with the superficial volar 

 palmar) arch. 



Radial 



recurrent 



artery 



Lig. annu- 

 lare rad 



Brachio- 



radialis 



Muscular 



branch of 



artery 



Radial artery 



Pronator teres 



ARTERIA ULNARIS. 



The ulnar artery (Figs. 768 and 

 T69) is the larger terminal branch, 

 3ut the less direct continuation of 

 :he brachial artery. It commences 

 n the cubital fossa, opposite the 

 ! leek of the radius, and terminates 

 n the palm of the hand, where it 

 mastomoses with the superficial 

 folar artery to form the superficial 

 v r olar (palmar) arch. 



From its origin it runs obliquely, 

 listally and ulnarwards, deep to the 

 , muscles arising from the medial 

 ]3picondyle, to the junction of the 

 proximal and middle thirds of the 

 forearm, where it comes into relation 

 with the ulnar nerve ; it then passes 

 directly distally, on the radial side of 

 the ulnar nerve, to the wrist ; crosses 

 anterior to the main part of the 

 transverse carpal ligament, on the 

 radial side of the pisiform bone, and 

 : enters the palm of the hand to form 

 'palmar) arch. 



Volar 



communicating 



artery 



Deep branch 

 of ulnar artery 



Deep volar 

 (palmar) arth 



Palmar 

 metacarpal 

 arteries 

 Digital 

 artery . 



FIG. 769. DEEP DISSECTION OF THE FRONT OF THE 

 FOREARM AND HAND, showing the radial and ulnar 

 arteries and their branches and the deep volar arch 

 and its branches. 



the main part of the superficial volar 



Relations Dorsal. Proximo-distally it lies volar to the distal part of the brachialis, 



