When you make a fist, your finger joints move at in the skin on the anterior surface of the hand, where the skin is bound to deeper tissues.

Flexion creases.

Explanation: Fist is a term used to describe the tightening of the fingers to the palm as if you want to punch someone.

Flexion is used to refer to a movement that decreases the angle between two body parts.

Flexion at the hands is the bringing of the fingers close to the palm folded.

Flexion creases is the location of the firm attachment of a part of the body to another body structure as it can be seen with the fingers held tightly together to the palms of the hand.

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