Oct 30, 2023 · Flexor pollicis longus is a deep forearm flexor that flexes the thumb and contributes to flexing the wrist. Learn its anatomy and function at Kenhub!

Modern humans are unique among hominids in having a flexor pollicis longus (FPL) muscle belly that is separate from that of the flexor digitorum profundus (FDP). While the FPL is not a …

The muscle forms a flattened large tendon, that courses through the carpal tunnel, crossing three joints of the hand to attach at the base of the distal phalanx.

Nov 25, 2025 · The flexor pollicis longus (FPL) muscle is one of the two muscles that make up the third layer of the anterior compartment of the forearm, along with the flexor digitorum …

Interactive 3D model and details on the anatomy of the flexor pollicis longus muscle covering its origin, insertion, action, innervation and blood supply.

Jul 24, 2023 · The muscle tapers into a long, flat tendon that courses superficial to the pronator quadratus muscle and directly lateral to the index finger tendon of FDS. The FPL tendon, now …

The fibers of the flexor pollicis longus muscle travel inferiorly to the hand and insert, via a flat tendon, onto the palmar aspect of the base of the distal phalanx of thumb.

Mar 25, 2025 · The flexor pollicis longus is critical for activities requiring hand grasping since it is the only muscle capable of bending the thumb’s interphalangeal joint.

Its tendon passes through the carpal tunnel, specifically lateral to the tendons of the flexor digitorum profundus, before reaching the thumb. The tendon of the flexor pollicis longus …

Feb 21, 2024 · Origin and Path: The FPL originates from the front of the radius bone and the adjacent interosseous membrane. This starting point allows it to run down the forearm, where …