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Flexor Pollicis Longus
The flexor pollicis longus is a muscle that is unique to humans, found in the forearm and hand that flexes the thumb. It lies in the same plane as the flexor digitorum profundus.
The word pollicis refers to the thumb and so the flexor pollicis longus is the long muscle which flexes the thumb!
Anatomy of the Flexor Pollicis Longus
The flexor pollicis longus is supplied by the anterior interosseus artery and innervated by the anterior interosseous nerve.
The flexor pollicis longus arises from the grooved anterior surface of the body of the radius, extending from immediately below the tuberosity and oblique line to within a short distance of the pronator quadratus muscle.
It arises also from the adjacent part of the interosseous membrane of the forearm, and generally by a fleshy slip from the medial border of the coronoid process of the ulna, or from the medial epicondyle of the humerus.
Functions of the Flexor Pollicis Longus
The flexor pollicis longus is a flexor of the phalanges of the thumb; when the thumb is fixed, it assists in flexing the wrist.
You will normally use the flexor carpi radialis when gripping something tightly or anytime you use the thumb.
Some of the exercises that can make the flexor pollicis longus stronger include wrist flexion using resistance and the wrist flexor stretch.
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