Palmaris brevis muscle

Palmaris brevis muscle

The Palmaris brevis muscle is a small, thin muscle located in the hand. It is situated on the ulnar side of the hand and is part of the hypothenar eminence, which is the fleshy mass at the base of the little finger.

Anatomy

The Palmaris brevis muscle originates from the flexor retinaculum of the hand and the palmar aponeurosis. It inserts into the skin on the ulnar border of the hand. The muscle is innervated by the ulnar nerve, specifically the superficial branch of the ulnar nerve.

Function

The primary function of the Palmaris brevis muscle is to improve the grip of the hand by pulling on the skin over the hypothenar eminence. This action helps to deepen the hollow of the palm, thereby enhancing the grip.

Clinical Significance

The Palmaris brevis muscle is often used as a landmark in surgical procedures involving the hand. Its superficial location makes it easily identifiable. Additionally, the muscle can be involved in certain medical conditions such as Dupuytren's contracture, where the palmar fascia becomes thickened and contracted.

Related Structures

• Flexor retinaculum of the hand
• Palmar aponeurosis
• Ulnar nerve
• Hypothenar eminence

See Also

• Muscles of the hand
• Anatomy of the hand
• Ulnar nerve entrapment