palmar carpal branch of ulnar artery palmar carpal branch of ulnar artery the palmar carpal branch of ulnar artery (volar carpal branch) is a small vessel which crosses the front of the carpus beneath the tendons of the flexor digitorum profundus, and anastomoses with the corresponding branch of the radial artery. palmar carpal branch of ulnar arteryulnar and radial arteries. deep view. (palmar carpal branch of radial artery labeled as "volar ulnar carpal", at lower right.)detailssourceulnar arterybranchespalmar carpal archidentifierslatinramus carpalis palmaris arteriae ulnarista98a12.2.09.054ta24669fma22817anatomical terminology