Flexor carpi ulnaris muscle

Flexor carpi ulnaris muscle

The flexor carpi ulnaris muscle is a muscle of the human forearm that acts to flex and adduct the hand. It is one of the superficial muscles of the forearm and is located on the ulnar side of the forearm.

Structure

The flexor carpi ulnaris muscle has two heads: the humeral head and the ulnar head. The humeral head originates from the medial epicondyle of the humerus, while the ulnar head originates from the olecranon and the upper two-thirds of the posterior border of the ulna. The muscle fibers converge to form a tendon that inserts into the pisiform, the hook of the hamate, and the base of the fifth metacarpal bone.

Innervation

The flexor carpi ulnaris muscle is innervated by the ulnar nerve, which arises from the brachial plexus. Specifically, the nerve fibers originate from the C8 and T1 spinal nerve roots.

Function

The primary functions of the flexor carpi ulnaris muscle are to flex and adduct the hand at the wrist joint. This muscle plays a crucial role in movements that require gripping and holding objects.

Blood Supply

The blood supply to the flexor carpi ulnaris muscle is provided by the ulnar artery, which runs alongside the ulnar nerve in the forearm.

Clinical Significance

Injuries or conditions affecting the flexor carpi ulnaris muscle can lead to pain and dysfunction in the forearm and hand. Common issues include tendinitis and ulnar nerve entrapment. Proper diagnosis and treatment are essential for restoring function and alleviating pain.

See Also

• Flexor carpi radialis muscle
• Extensor carpi ulnaris muscle
• Forearm muscles
• Ulnar nerve