Thumb Opposability | Center for Academic Research and Training in Anthropogeny (CARTA) - human opposable thumb

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Opposable thumb | Definition of Opposable thumb at Dictionary.com human opposable thumb


The thumb is the first digit (finger) of the hand. When a person is standing in the medical Is opposable to the other four fingers; Has two phalanges rather than three; Has greater breadth in the distal phalanx . There is a variation of the human thumb where the angle between the first and second phalanges varies between.

Human thumbs are called opposable thumbs. They are called opposable because the thumb can be moved around to touch the other fingers.

In contrast, the human hand has a much larger, more muscular, mobile, and fully opposable thumb combined with fingers that have shortened.

Opposable thumb definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and A thumb that can be placed opposite the fingers of the same hand. The opposable thumb of human beings allows us to use tools.

Of all the motions the hand can perform, perhaps none is so distinctively human as a punch in the nose. Other animals bite, claw, butt or stomp.