. Cunningham's Text-book of anatomy. Anatomy. THE ULNAE AETEEY. 921 Relations 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 turns ulnarwards, deep to the proximal oblique part of the adductor muscle of the thumb, and, after passing through the proximal Biceps Radial recurrent artery Lig. annu- lare radii Brachio- radialis Muscular branch of artery Radial artery Pronator tere Flexor pollicis longus fibres of the transverse part of the adductor pollicis, or between the ad- jacen
. Cunningham's Text-book of anatomy. Anatomy. THE ULNAE AETEEY. 921 Relations 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 turns ulnarwards, deep to the proximal oblique part of the adductor muscle of the thumb, and, after passing through the proximal Biceps Radial recurrent artery Lig. annu- lare radii Brachio- radialis Muscular branch of artery Radial artery Pronator tere Flexor pollicis longus fibres of the transverse part of the adductor pollicis, or between the ad- jacent borders of the oblique and trans- verse parts of the muscle, it unites with the deep branch of the ulnar artery, completing the deep volar (palmar) arch. Branches of the third part.— (1) The princeps pollicis branch is given off as soon as the radial artery enters the palm. It runs distally, on the volar aspect of the first metacarpal bone, between the adductor and the opponens pollicis, and under cover of the long flexor tendon, and divides, near the distal end of the bone, into collateral branches which run along the sides of the thumb and anastomose with the dorsales pollicis arteries. (2) The volaris indicis radialis is a branch which runs distally between the ulnar head of the first dorsal inter- osseous muscle and the adductor of the thumb and along the radial side of the index-finger to its tip, supplying the adjacent tissues ; not uncommonly it anastomoses with the superficial volar (palmar) arch. ARTERIA ULNARIS. The ulnar artery (Figs. 768 and 769) is the larger terminal branch, but the less direct continuation of the brachial artery. It commences in the cubital fossa, opposite the neck of the radius, and terminates in the palm of the hand, where it anastomoses with the superficial Radians volar artery to form the superficial indicis volar (palmar) arch. Erom its origin it runs obliquely, distally, and ulnarwards, deep to the muscles arising from the medial epic
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