Deep palmar branch of the ulnar artery
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The deep palmar branch of the ulnar artery originates from the ulnar artery near the base of the fifth metacarpal. It contributes to the arterial supply of the opponens pollicis, hypothenar and interossei muscles. It also supports the supply of the palmar aspect of the metacarpus and digits, via its anastomosis with the deep palmar arch 1.
The deep palmar branch of the ulnar artery courses distally from its origin, piercing opponens digiti minimi to continue laterally, deep to the flexor digitorum tendons. It meets and anastomoses with the deep palmar arch of the radial artery 2.