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Any of the digits of the hand. Each finger has three phalanges, except for the thumb, which has two. The phalanges join at hinge joints moved by muscle tendons that bend or straighten the finger. The tendons are covered by synovial sheaths that contain synovial fluid, to enable the muscles to work without friction. A small artery, vein, and nerve run down each side of the finger. The entire structure is enclosed in skin with a nail at the tip.

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