Which distal row carpal bone articulates with the first metacarpal at the base of the thumb?

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Multiple Choice

Which distal row carpal bone articulates with the first metacarpal at the base of the thumb?

Explanation:
The key idea is which distal row carpal bone forms the base joint with the thumb. The trapezium is the bone that articulates with the base of the first metacarpal, creating the carpometacarpal joint of the thumb. This joint is a saddle type, which gives the thumb its distinctive wide range of motion, including opposition. The other distal row bones interact with the bases of the other metacarpals (second through fifth) and do not connect with the first metacarpal. So the bone at the base of the thumb is the trapezium.

The key idea is which distal row carpal bone forms the base joint with the thumb. The trapezium is the bone that articulates with the base of the first metacarpal, creating the carpometacarpal joint of the thumb. This joint is a saddle type, which gives the thumb its distinctive wide range of motion, including opposition. The other distal row bones interact with the bases of the other metacarpals (second through fifth) and do not connect with the first metacarpal. So the bone at the base of the thumb is the trapezium.

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