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Muscular variations of the fl exor compartment of forearm are usual and can result in multiple clinical conditions limiting the functions of forearm and hand. Th e variations of the muscles, especially accessory muscles may simulate soft tissue tumors and can result in nerve compressions. During a routine dissection of the anterior region of the forearm and hand, an unusual muscle was observed on the left side of a 65-year-old male cadaver. Th e anomalous muscle belly arose from the medial epicondyle approxiamately 1 cm posterolateral to origin of normal fl exor carpi ulnaris muscle (FCU), and from proximal part of the fl exor digitorum superfi cialis muscle. It inserted to the triquetral, hamate bones and fl exor retinaculum. Passive traction on the tendon of accessory muscle resulted in fl exion of radiocarpal junction. Th e FCU which had one head, inserted to the pisiform bone hook of hamate and palmar aponeurosis. Its contiguous muscles displayed normal morphology. Knowledge of the existence of muscle anomalies as well as the location of compression is useful in determining the pathology and appropriate treatment for compressive neuropathies. In this study, a rare accessory muscle has been described.