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Which hand muscle separates the fingers?

  1. Buccinator

  2. Abductor

  3. Supinator

  4. Opponens

The correct answer is: Abductor

The abductor muscle separates the fingers by pulling them away from each other. This differs from the other options as the Buccinator is used for blowing (i.e., whistling), the Supinator turns the palm upward, and the Opponens is responsible for moving the thumb towards the fingers. So, while all of these muscles are important for hand movements, only the abductor is specifically responsible for separating the fingers.