In this article, we will discuss about the Extensor pollicis brevis muscle. So, let’s get started.
Extensor pollicis brevis muscle
It originates from the interosseous membrane, and lower 1/3rd of the posterior part of the radius and gets inserted into the posterior surface of base of the proximal phalanx of the thumb. It is innervated by the posterior interosseous nerve (branch of the radial nerve) and artery supply is through the posterior interosseus artery. Its chief action is extension of the thumb at the metacarpophalangeal joint, abduction of carpometacarpal joint, and assists in radial deviation.