Superficial Palmar Arch
The Superficial Palmar Arch arises primarily
from the ulnar artery. It gives rise to the common palmar digital branches and
successively proper digital palmar branches that distribute as far distally
as the tips of digits two through five. The arch enters the palm with the ulnar
nerve, passes anterior to the flexor retinaculum, and receives the Superficial
Palmar Branch of the Radial artery. It lies deep to the palmar aponeurosis.
The superificial palmar arch is badly named, for in two-thirds of hands it has a hockey-stick shape and is not a complete arch (formed by the ulnar artery alone).