Possible compression of ulnar nerve by an abnormal muscle originating from the tendon of palmaris longus

Saju Binu Cherian

Abstract

Presence of abnormal muscles in the distal forearm and hand is not uncommon. We report an abnormal muscle in the distal part of the forearm and hand. The muscle took its origin from the distal part of the tendon of palmaris longus muscle and crossed superficial to ulnar nerve and vessels. It passed superficial to the hypothenar muscles and got inserted to the base of the fifth metacarpal bone. This abnormal muscle might compress the ulnar nerve, ulnar artery or both.