Palmaris Brevis is a small cutaneous muscle that lies in the fascia over the hypothenar eminence.
It originates from the flexor retinaculum and palmar aponeurosis.
It inserts on the skin of the medial border of the hand.
The Palmaris Brevis is innervated by the superficial branch of the ulnar nerve.
It is supplied by the superficial palmar arch.
Palmaris Brevis improves the palmar grip action by pulling on the skin over the hypothenar muscles, which deepens the hollow of the palm.
The innervation of the Palmaris Brevis is by the only motor component of the superficial branch of the ulnar nerve. This is makes it possible to diagnose the site of lesions to the ulnar nerve at the wrist, based on whether palmaris brevis function is affected or not. It may also help to protect the ulnar nerve and ulnar artery from compression in the ulnar canal during repetitive grasping motions.
- Jenkins DB. Hollinshead's Functional Anatomy of the Limbs and Back, 9th edition. Elsevier Health Services, 2008.
- Drake, RL, Vogl, W., Mitchell, AWM, Tibbitts, R., Richardson, P., Horn, A., & Gray, H. (2020). Gray's anatomy for students .
- Moore, C., & Rice, C. (2017, August 08). Structural and functional anatomy of the palmaris brevis: Grasping for answers. Retrieved October 22, 2020, from https://onlinelibrary.wiley.com/doi/full/10.1111/joa.12675