Extensor pollicis longus / brevis

Functional Rehab Academy

Muscle origin: Posterior surface of middle third of ulna and interosseus membrane (Extensor pollicis longus). Posterior surface of distal third of radius and interosseus membrane (Extensor pollicis brevis)

Muscle insertion: Posterior aspect of base of distal phalanx of thumb (Extensor pollicis longus). Posterior aspect of base of proximal phalanx of thumb (Extensor pollicis brevis)

Muscle function: Wrist extension, extension of Metacarpophalangeal and interphalangeal joint of thumb (Extensor pollicis longus). Extension of Carpometacarpal and metacarpophalangeal joint of thumb, and control of Radius (Extensor pollicis brevis)

Nerve innervation: C7-8 (Lovett reactor T10-11)

Myofascial lines:

Primary inhibatory muscles

Related joints: Radioulnar, Carpometacarpal, Metacarpophalangeal and interphalangeal joint of thumb

Longus

Thumb is placed in full extension and forearm in full supination. Stabilize the proximal phalanx of the Pollicis and apply pressure on the back side of the distal phalanx towards flexion of the distal joint.

Brevis

Thumb is placed in full extension and forearm in full supination. Stabilize the 1st metacarpal bone and apply pressure on the back side of the proximal phalanx towards flexion of the base joint.

Functional anatomy for