Flexor Pollicis Longus - Muscle Physiology & Functional Anatomy


Flexor Pollicis Longus Muscle




  • Anterior surface of radius below anterior oblique line & adjacent interosseous membrane


  • Base of distal phalanx of thumb

Major Arteries:

  • Anterior interosseus artery


Neural Innervation:

  • Anterior interosseous nerve (C7-C8)


Trigger Points: 

Trigger Points of the flexor pollicis longus




Concentric Functions:

  • Flexes distal phalanx of thumb

  • Assists in wrist flexion (when thumb is fixed)

Eccentric Functions:

Isometric Function:

Related Muscles





More Images of the Flexor Pollicis Longus Muscle

How to Palpate the Flexor Pollicis Longus

Flexor Pollicis Longus

More Information about the Flexor Pollicis Longus Muscle

The flexor pollicis longus muscle lies in the same plane as the flexor digitorum profundus and is only found in humans (absent or rudimentary in primates).


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