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Which muscle covers the back of the neck and upper back?

  1. Platysma

  2. Trapizeus or latissimus dorsi

  3. Procerus

  4. Oris orbicularis

The correct answer is: Trapizeus or latissimus dorsi

The upper back and neck are primarily covered by the trapezius and latissimus dorsi muscles, commonly referred to as "traps." While the platysma muscle does cover the front and lower sides of the neck, it does not extend to the upper back. The procerus muscle is located in the forehead and is not involved in covering the back of the neck. The orbicularis oris muscle is found in the mouth and is not related to the neck or upper back at all. Therefore, option B is the correct answer as it is the only muscle listed that covers the specified area.