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)
(wikipedia)