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The muscle that surrounds the lower part of the lip is the:

  1. Orbicularis Oris

  2. Zygomaticus

  3. Depressor Labii Inferioris

  4. Buccinator

The correct answer is: Depressor Labii Inferioris

The muscle that surrounds the lower part of the lip is the Depressor Labii Inferioris. The other muscle options do not directly surround the lower lip. The Orbicularis Oris and Zygomaticus muscles are involved in different facial expressions and the Buccinator muscle is located in the cheek and assists with chewing and blowing. Therefore, they are not considered the primary muscle responsible for surrounding the lower lip.