Abductor minimi digiti

The abductor digiti minimi muscle of the hand is a muscle located in the hypothenar eminence of the hand. It is one of the intrinsic muscles of the hand and plays a crucial role in the movement of the little finger.

Anatomy

Origin

The abductor digiti minimi originates from the pisiform bone, which is a small, pea-shaped carpal bone located in the proximal row of the carpal bones.

Insertion

The muscle inserts into the base of the proximal phalanx of the little finger, also known as the fifth digit or digitus minimus.

Blood Supply

The blood supply to the abductor digiti minimi is primarily provided by the ulnar artery, which is one of the major arteries of the forearm and hand.

Innervation

The muscle is innervated by the deep branch of the ulnar nerve. The ulnar nerve is responsible for the innervation of most of the intrinsic muscles of the hand, particularly those in the hypothenar region.

Function

The primary function of the abductor digiti minimi is to abduct the little finger. Abduction refers to the movement of the finger away from the midline of the hand. This action is important for the spreading of the fingers and contributes to the grip and manipulation of objects.

Clinical Significance

Injury

Injury to the ulnar nerve can affect the function of the abductor digiti minimi, leading to weakness or inability to abduct the little finger. Such injuries can occur due to trauma, compression, or neuropathies such as cubital tunnel syndrome.

Surgical Considerations

During surgical procedures involving the hand, care must be taken to preserve the integrity of the ulnar nerve to maintain the function of the abductor digiti minimi and other hypothenar muscles.

Related Muscles

The abductor digiti minimi is part of the hypothenar muscle group, which also includes the flexor digiti minimi brevis and the opponens digiti minimi. These muscles work together to facilitate complex movements of the little finger.

See Also

• Hypothenar eminence
• Ulnar nerve
• Intrinsic muscles of the hand