Why is your thumb call a thumb and not a finger?

Answers:

It's one of those "which one of these is not like the others".

The thumb contrasts beside each of the (other) four by mortal the only finger that:
* Is opposable
* Has two phalanges to some extent than three
* Has its inmost phalanx so close to the wrist
* Has much greater breadth and stubby proportions
* Is attached to such a mobile metacarpus (which produces most of the opposability)

The thumb, unlike other fingers, is opposable, in that it is the only digit on the human paw which is able to defy or turn back against the other four fingers, and thus enable the hand to refine its grip to hold objects which it would be incompetent to do otherwise. The opposable thumb has help the human species develop more accurate fine motor skills.

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well it is really called the first digit

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It is my question too, but why should I verbs about the nomenclature of the THUMB, as in attendance are mega-ideas that seek tangible answers.

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I t is not that unusual to replace a severally injured thumb near one of the other fingers on that hand. I would appointment it a thumb then and not a pinky. You might guess I worked in a contrivance shop.