palmar metacarpal arteries palmar metacarpal arteries the palmar metacarpal arteries (volar metacarpal arteries, palmar interosseous arteries) are three or four arteries that arise from the convexity of the deep palmar arch. palmar metacarpal arteriesulnar and radial arteries. deep view (volar metacarpal visible at bottom center).detailssourcedeep palmar archveinpalmar metacarpal veinsidentifierslatinarteriae metacarpales palmares, arteriae metacarpeae volaresta98a12.2.09.039ta24653fma70802anatomical terminology structure the palmar metacarpal arteries arise from the convexity of the deep palmar arch. they run distally upon the palmar interossei muscles. they anastomose at the clefts of the fingers with the common palmar digital arteries which arise from the superficial palmar arch.