September 24, 2014

My Thumb Will Go On

More from Titanic with apologies to Celine Dion and My Heart Will Go On.

Video: Thumbtanic: My Heart is a Thumb.

The thumb contrasts with each of the other four by being the only digit that:

    Is opposable to the other four fingers
    Has two phalanges rather than three
    Has greater breadth in the distal phalanx than in the proximal phalanx
    Is attached to such a mobile metacarpus (which produces most of the opposability)

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