Hypothenar muscle

Hypothenar Muscles

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Hypothenar muscles of the human hand

The Hypothenar muscles are a group of three muscles of the palm that control the movement of the little finger. These muscles are located in the hypothenar eminence, the fleshy mass at the base of the little finger. The hypothenar muscles include the abductor digiti minimi, the flexor digiti minimi brevis, and the opponens digiti minimi.

Structure

The hypothenar muscles originate from the carpal bone region and attach to the medial side of the metacarpal bone of the little finger. They are innervated by the ulnar nerve and receive blood supply from the ulnar artery.

Abductor Digiti Minimi

The abductor digiti minimi is responsible for the abduction of the little finger away from the hand's midline.

Flexor Digiti Minimi Brevis

The flexor digiti minimi brevis flexes the little finger at the metacarpophalangeal joint.

Opponens Digiti Minimi

The opponens digiti minimi rotates the fifth metacarpal bone around its long axis, drawing the little finger towards the center of the palm.

Function

The hypothenar muscles allow for the independent movement of the little finger, which is crucial for a strong grip and fine motor skills.

Clinical Significance

Damage to the ulnar nerve can lead to a loss of function in the hypothenar muscles, a condition known as claw hand.

See Also

• Thenar muscles
• Intrinsic muscles of the hand
• Ulnar nerve
• Carpal tunnel syndrome