Which is an action of the flexor pollicis brevis?
A)adduction of the thumb at the carpometacarpal joint
B)flexion 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 flexor pollicis brevis is a muscle located in the palm of the hand that is responsible for flexion of the thumb at the carpometacarpal joint. Therefore, option B is the correct choice. Option A is incorrect because the adduction of the thumb is mainly performed by the adductor pollicis muscle. Option C is incorrect because the lateral rotation of the thumb is mainly performed by the abductor pollicis longus muscle. Option D is incorrect because the flexor pollicis brevis muscle is not involved in the movement of the index finger.

Which Is an Action of the Flexor Pollicis Brevis