Extensor Pollicis Brevis - Everything You Need To Know - Dr. Nabil Ebraheim

Dr. Ebraheim’s educational animated video describes the anatomy of the extensor pollicis brevis muscle, its origin, insertion, innervation, and all you need to know about it explained in a simple and easy animated video.

The origin of the extensor pollicis brevis arise from the posterior surface of the radius and the interosseous membrane. The extensor pollicis brevis is inserted into the base of the proximal phalanx of the thumb.
The extensor pollicis brevis extends the thumb at the metacarpophalangeal joint.
The extensor pollicis brevis is innervated by the posterior interosseous nerve.
Why is this muscle important? Both the extensor pollicis brevis and the abductor pollicis longus are involved in De Quervain’s syndrome. Sometimes the extensor pollicis brevis tendon is located within its own subsheath. Failure to recognize this anatomical variation, surgery will not work causing failure of decompression of the first compartment. May occur more in women. May have an association to postpartum state and development of this syndrome. The patient will have radial side wrist pain. The pain associated with De Quervain’s syndrome and intersection syndrome is different. If the tenderness is located about 5 cm proximal to the wrist joint, then this is probably intersection syndrome. Finkelstein’s test is used to diagnose De Quervain’s tenosynovitis in patient who have wrist pain. The Finkelstein test is conducted by making a first with the fingers closed over the thumb and the wrist is bent toward the little finger. The wrist is the pulled so that the tendons of the first dorsal compartment are stretched distally, causing sharp, local pain if tendon inflammation is present. Be aware that tenderness located over the first dorsal compartment at the level of the radial styloid process is probably De Quervain’s syndrome. Please note that the extensor pollicis brevis travels with the abductor pollicis longus in the first extensor compartment of the wrist and it forms the lateral margin of the anatomical snuff box.

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