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Flexor pollicis longus

Other Terms: Musculus flexor pollicis longus, Muscle long fléchisseur du pouce

Muscle parts

None

Latin name

Musculus flexor pollicis longus

Latin muscle parts

None

Group

Antebrachial muscle – anterior compartment – deep group

Etymology

In English this muscle’s name is the long muscle that bends the thumb. The word flexor comes from the Latin flectere meaning “to bend.” The Latin pollex meaning “thumb” arises from the Latin polleo meaning “to be strong,” as the thumb was the strongest of the fingers. Longus is the Latin term meaning “long.” This is being used as a comparative reference to a shorter muscle that does the same thing.

Origin

Anterior surface of radius from the base of the radial tuberosity to the pronator quadratus, radial side of the interosseous membrane

Insertion

Anterior (palmar) surface of the base of the distal phalanx of the thumb

Action

Flexes the phalanges of the thumb; weakly assists flexors of wrist

Nerve supply

Median nerve (C7 and C8)

Blood supply

Muscular branches from the radial artery and the anterior interosseous artery supply the meaty belly of the muscle. The long distal tendon of the muscle receives blood supply from the princeps pollicis artery and from branches from the deep palmar arch.

Latin

Musculus flexor pollicis longus

French

Muscle long fléchisseur du pouce

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