Extensor Pollicis Longus- Muscle Physiology & Functional Anatomy


Extensor Pollicis Longus Muscle




  • Middle 1/3 of posterior the ulna (below abductor pollicis longus) & adjacent interosseous membrane


  • Base of distal phalanx of thumb via Lister's tubercle (dorsal tubercle of radius)

Major Artery:

  • Radial artery*


Neural Innervation:

  • Posterior interosseous nerve (C7-C8)


Trigger Points: 





Concentric Functions:

  • Extends interphalangeal and metacarpophalangeal joints of the thumb

Eccentric Functions:

Isometric Function:

Related Muscles





More Images of the Extensor Pollicis Longus Muscle

how to palpate the extensor pollicis longus muscle

Extensor Pollicis Longus

More Information about the Extensor Pollicis Longus Muscle

*The tendon of the extensor pollicis longus muscle crosses the radial artery along with the tendons of the extensor pollicis brevis & the abductor pollicis longus.


Back to Anatomy InformationFunctional Anatomy Chart