Which is an action of the abductor pollicis brevis?
A)medial rotation of the thumb at the carpometacarpal joint
B)abduction of the thumb at the carpometacarpal joint
C)lateral rotation of the thumb at the carpometacarpal joint
D)flexion of the index finger (finger number two)at the carpometacarpal joint

Question

Quizplus · Accepted Answer

The abductor pollicis brevis muscle is responsible for abduction of the thumb at the carpometacarpal joint, meaning it moves the thumb away from the index finger. Medial rotation, lateral rotation, and flexion of the index finger are not actions of this muscle.

Which Is an Action of the Abductor Pollicis Brevis