The tendon of the extensor pollicis brevis was cut at the musculotendinous junction, removed at the base of the proximal phalanx of the thumb, tunneled subcutaneously toward the pisiform, placed ...

The abductor pollicis brevis and the flexor pollicis brevis allow for movement of the thumb away or towards the other fingers of the hand. The opponens pollicis enables the thumb to be opposable.

The tubercle (small rounded point) of the trapezium sometimes connects to the abductor pollicis brevis muscle. Anatomical Variations There are minor anatomical variations related to the trapezium ...

De Quervain tenosynovitis is pain and swelling in the tendons around your thumb. Specifically, it affects the tendons of two muscles called abductor pollicis longus and extensor pollicis brevis.