Deep Palmar Arch
The Deep Palmar Arch is formed by the anastomosis of the radial artery with the Deep Palmar Branch of the Ulnar artery. It crosses the bases of the metacarpal bones and interossei muscles, and is covered by the oblique head of adductor pollicis, the digital flexor tendons and the lumbricals. In its concavity, running laterally, is the deep branch of the ulnar nerve. The radial artery provides the majority of the arterial supply to the palm and thumb.
Bleeding is profuse when the palmer arterial arch is lacerated. It has numerous
communications in the forearm and hand. During surgery, it may be necessary
to compress the brachial artery proximal to the elbow.