Thumb
Thumb
The thumb (/θʌm/; from Old English þūma), also known as the pollex (/ˈpɒlɛks/; from Latin pollex, meaning "strong"), is the first digit of the human hand, located next to the index finger. The thumb is distinct from the other fingers due to its opposability, which allows for fine motor control.
Anatomy
The thumb consists of two phalanges, the proximal phalanx and the distal phalanx, and one metacarpal bone. The thumb is connected to the hand by the carpometacarpal joint, which allows for the thumb's wide range of motion.
Function
The thumb's opposability allows it to touch the tips of the other fingers, enabling precision grip and manipulation of objects. This feature is a defining characteristic of primate hands, including those of humans.
Related Terms
- Opposable thumb: A thumb that can be positioned opposite to the fingers.
- Thumb signal: A gesture in which the thumb is extended upward or downward in approval or disapproval.
- Thumb war: A game played by two people in an attempt to pin the opponent's thumb.
Etymology
The English word "thumb" comes from the Old English þūma, while "pollex" comes from the Latin pollex, meaning "strong".
External links
- Medical encyclopedia article on Thumb
- Wikipedia's article - Thumb
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