palmar arch
nounMedical Definition of palmar arch
: either of two loops of blood vessels in the palm of the hand:
a
: a deeply situated transverse artery that is composed of the terminal part of the radial artery joined to a branch of the ulnar artery and that supplies principally the deep muscles of the hand, thumb, and index finger
— called also deep palmar arch
b
: a superficial arch that is the continuation of the ulnar artery which anastomoses with a branch derived from the radial artery and that sends branches mostly to the fingers
— called also superficial palmar arch