Which is an action of the dorsal interossei manus at the metacarpophalangeal joint?
A)adduction of fingers two,three,and four
B)abduction of fingers two,three,and four
C)medial rotation of fingers two,three,and four
D)abduction of fingers three,four,and five

Question

Quizplus · Accepted Answer

The dorsal interossei manus muscles are responsible for the abduction of the fingers at the metacarpophalangeal joint. More specifically, they abduct the fingers away from the midline of the hand, meaning in the case of the dorsal interossei manus, they abduct fingers two, three, and four. Choice A is incorrect because adduction would bring the fingers closer together. Choice C is incorrect because medial rotation refers to turning the fingers toward the middle finger, which is not a movement facilitated by the dorsal interossei manus. Choice D is incorrect because the dorsal interossei manus muscle does not facilitate abduction of the fifth finger; that action is performed by the abductor digiti minimi.

Which Is an Action of the Dorsal Interossei Manus at the Metacarpophalangeal