Flexor pollicis brevis

The flexor pollicis brevis muscle is a muscle in the hand. It flexes the thumb at the first metacarpophalagneal joint. This is in opposition to the extensor pollicis brevis muscle, which extends the thumb. Severe injury to this muscle would impair the thumb's ability to move. The thumb is the most versatile digit of the hand. If the muscles of the thumb are impaired, many actions involving the hand become difficult or impossible. The flexor pollicis brevis originates at the flexor retinaculum of the hand. This refers to a band of fibers that stretch over the hand's carpus. The muscle also possesses an origination point at the trapezium carpal bone. It inserts into the thumb's proximal phalanx bone. With a continuous supply of oxygenated blood, the superficial palmar arch services the muscle. In addition, the superficial palmar venous arch assists in draining deoxygenated blood away. The flexor pollicis brevis muscle is innervated by both the recurrent branch of the median nerve and the deep branch of the ulnar nerve.

Written and medically reviewed by the Healthline Editorial Team
Co-developed by:

In Depth: Flexor pollicis brevis

Debugging Tools

Level: 3
Frame: 1
Toggle Hotspot
VP Data Tool
HexTable json from Steve
Steve's ajax layer update call:
[still on original layer]

Ad values:

adModel.dfpAdSite: hn.us.hl.bm.x.x.x
adParams['k1']: othermusculoskeletaldisorders,flexor_pollicis_brevis_muscle,9104314

More on BodyMaps

Take a Video Tour

Learn how to rotate, look inside and explore the human body. Take the tour

BodyMaps Feedback

How do you like BodyMaps? How can we improve it? Tell us what you think