Abductor Pollicis longus
Flexor Pollicis longus
Extensor Pollicis longus
Answer C) Flexor Pollicis longus
Flexor pollicis longus (FPL)
- The flexor pollicis longus (FPL) is a long muscle located at the deep layer with flexor digitorum profundus and pronator quadratus in the anterior compartment of the forearm.
- Though it is situated at the forearm, it is classified as part of the extrinsic muscles of the hand as it’s function is seen in thumb movement.
- It is innervated by the median nerve via the anterior interosseous nerve (7th and 8th cervical nerve root).
The FPL mainly flexes the interphalangeal joint of the distal phalanx of the thumb.
It also serves as accessory flexors of the metacarpophalangeal of the proximal phalanx and carpometacarpal joints of the first metacarpal.
It may also assist in wrist joint flexion