Which is an eccentric function of the flexor pollicis brevis?
A)restrains/slows medial rotation of the thumb at the carpometacarpal joint
B)restrains/slows flexion of the thumb at the carpometacarpal joint
C)restrains/slows extension of the thumb at the carpometacarpal joint
D)restrains/slows flexion of the index finger (finger number two)at the carpometacarpal joint

Question

Quizplus · Accepted Answer

The flexor pollicis brevis primarily functions to flex the thumb at the carpometacarpal and metacarpophalangeal joints. In an eccentric action, where the muscle lengthens under tension, it would act to control or slow down the extension of the thumb at the carpometacarpal joint, making option C correct.

Which Is an Eccentric Function of the Flexor Pollicis Brevis