The range and direction of motion at the first carpometacarpal (CMC) joint produces opposition of the thumb. Opposition is sequentially ____________________
a. abduction, flexion, and adduction of the first metacarpal
b. adduction, flexion, and abduction of the first metacarpal
c. abduction, extension, and adduction of the first metacarpal
d. Opposition does not occur at this joint.
ANS: A
The unique range and direction of motion at the first CMC joint produces opposition of the thumb. This opposition is a sequential succession of the planar motions of thumb in the order of abduction, flexion, and adduction of the first metacarpal with simultaneous rotation.
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