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.

De Quervain’s tenosynovitis is swelling of the two tendons at the bottom of this area called abductor pollicis brevis and extensor pollicis brevis. Women are about four times more likely than ...