extensor pollicis brevis muscle

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ex·ten·sor pol·li·cis brev·is mus·cle

(eks-ten'sŏr pol'i-sis brē'vis mŭs'ĕl)
Muscle of posterior (extensor) compartment of forearm; origin, dorsal surface of distal radius and adjacent interosseous membrane; insertion, posterior aspect of base of proximal phalanx of thumb; action, extends and abducts the thumb at metacarpophalangeal joint; nerve supply, radial joint (posterior interosseous).
Synonym(s): musculus extensor brevis pollicis, musculus extensor pollicis brevis, short extensor muscle of thumb.
References in periodicals archive ?
Reconstruction of the collateral ligaments using the extensor pollicis brevis tendon.
Caption: Figure 5: Intraoperative photographs showing 3D printed titanium first metacarpal prosthesis with the ligament reconstruction in the proximal and distal portions: free palmaris longus tendon graft (blue arrow head), flexor carpi radialis tendon (yellow arrow head), and extensor pollicis brevis tendon (blue arrow).
Stenosing tendovaginitis of abductor pollicis longus and extensor pollicis brevis at the radial styloid (de Quervain's disease).
Anatomical variations of the extensor pollicis brevis tendon and abductor pollicis longus tendon-relation to tenosynovectomy.
Other evolutionary changes occurred to accommodate this new mobility of the thumb, including development of thenar muscles for opposition and the extensor pollicis brevis tendon for extension.
De Quervain's tenosynovitis (radial styloid tenosynovitis) involves painful inflammation of the 2 tendons in the first dorsal compartment of the wrist--the abductor pollicis longus (APL) and the extensor pollicis brevis (EPB).
Extensor pollicis Brevis is completely separated and much smaller only in man.
(3,4) It is usually caused by overuse or an increase in repetitive activity, resulting in shear microtrauma from repetitive gliding of the first dorsal compartment tendons (abductor pollicis longus or APL, and extensor pollicis brevis or EPB) beneath the sheath of the first compartment over the styloid of the radius leading to thickening of the extensor retinaculum of the wrist (and not related to inflammation as was once thought).
The RCE muscle tendons at the distal third level of the forearm were found under the muscle fibers of the abductor pollicis longus and extensor pollicis brevis, and distally to the retinaculum of the extensor muscles under the extensor pollicis longus muscle tendon, forming part of the dorsoulnar corner of the anatomical snuffbox in 100 % of the samples in the case of the ECRL muscle tendon, and in 26.7 % (8 of 30 samples) in the case of the ECRB muscle tendon.
(5) Innervation to the extensor pollicis longus (EPL), extensor digiti minimi (EDM), extensor pollicis brevis (EPB), and extensor indicis proprius (EIP) follows as the PIN gives off its most distal motor branch on average 11.5 cm proximal to the radial styloid.
3) A deep part which is innervated by posterior interosseous nerve -Abductor pollicis longus and Extensor pollicis brevis on the radial side and Extensor pollicis longus and Extensor indicis on the ulnar side.

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