THUMB
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The sixth finger is typically referred to as a polydactyl digit. This condition is characterized by extra fingers or toes beyond the usual five digits on a hand or foot.
The pointer finger is the second digit on the hand, next to the thumb. It is also known as the index finger.
If standing in anatomical position with palms facing out, the thumb is the lateral digit of the hand, as lateral means "away from midline" vs. medial, which would be toward the midline of the body.
The thumb is the first digit on our hands, a very important digit, if you damage your thumbs you will find your hands cannot function properly, such daily things we do like tying our shoe laces, or picking up coins, cannot be done without the use of our thumbs.
The pollex is another name for the thumb on the human hand. It is the first digit, located on the same side as the palm.