Opposition of the thumb at the 1st carpometacarpal joint is a combination of what actions?

Question

Quizplus · Accepted Answer

Opposition of the thumb involves flexion, medial rotation, and abduction, allowing the thumb to touch the other fingers. Choice A is incorrect because there is no lateral rotation involved in opposition of the thumb. Choice C is incorrect because extension, not flexion, is involved in opposition. Choice D is incorrect because there is no medial rotation involved in opposition of the thumb.

Opposition of the Thumb at the 1st Carpometacarpal Joint Is