palmar carpal branch of radial artery palmar carpal branch of radial artery the palmar carpal branch of the radial artery is a small branch of the radial artery which arises near the lower border of the pronator quadratus, and, running across the front of the carpus, anastomoses with the palmar carpal branch of the ulnar artery. palmar carpal branch of radial arteryulnar and radial arteries. deep view. (palmar carpal branch of radial artery labeled as "volar radial carpal", at lower left.)detailssourceradial arterybranchespalmar carpal archidentifierslatinramus carpalis palmaris arteriae radialista98a12.2.09.030ta24644fma22750anatomical terminology