Anatomy, Shoulder and Upper Limb, Forearm Flexor Carpi Ulnaris Muscle

Excerpt

The flexor carpi ulnaris (FCU) is a superficial flexor muscle of the forearm that flexes and adducts the hand (see Image. Anterior Forearm Compartment Muscles). This muscle is the most powerful wrist flexor and the only anterior forearm compartment muscle completely innervated by the ulnar nerve. The FCU tendon is a landmark for locating the ulnar nerve and artery during surgery, as these structures lie immediately lateral to the muscle (see Image. Hand Ligaments and Fascia).

Chronic wear and tear and trauma are the most frequent causes of FCU injuries. In surgery, this muscle is vital to wrist procedures like wrist and hand tendon transfers and cubital tunnel release. Understanding the FCU's surgical importance is essential for healthcare professionals treating conditions affecting the forearm, wrist, and hand.