Facts About Thumbs

  • “Finger” has two different definitions:
    • Any of the five digits on the hand
    • Any of the four terminal members of the hand, excluding the thumb

 

  • Unlike the other four fingers, the thumb has these unique characteristics:
    • is attached to a mobile metacarpus (which is what makes it opposable and apposable)
    • has two phalanges instead of three
    • has greater breadth in the distal phalanx than in the proximal phalanx

 

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