A superficial artery may be present in the forearm, arising
from the axillary, brachial or superficial brachial arteries
and crossing over the origin of the flexor muscles of the
forearm to reach the palm (Adachi, 1928; Bergman et al.
1988). When this superficial artery continues as the normal
ulnar artery accompanying the ulnar nerve at the wrist, it is
referred to as the superficial ulnar artery, with an incidence
of ∼4%. When the artery passes below or superficial to the
flexor retinaculum in the middle of the forearm, sometimes
continuing to join the superficial palmar arch, it is called the
superficial median artery, with an incidence of ∼1%. We
have observed a relatively rare variation involving the
presence of a superficial median artery in both upper limbs.
We discuss the clinical importance and the developmental
aspects of this arterial variation.