ANATOMY

Detailed explanation-1: -The zygomaticus major muscle is a muscle of the human body. It extends from each zygomatic arch (cheekbone) to the corners of the mouth. It is a muscle of facial expression which draws the angle of the mouth superiorly and posteriorly to allow one to smile.

Detailed explanation-2: -The buccinator draws the corner of the mouth laterally and compresses the cheek (as when whistling and sucking).

Detailed explanation-3: -Technically, the zygomaticus muscles contract to draw the corners of the mouth upward and outward to create your smile.

Detailed explanation-4: -Of all the muscles in the face, the zygomaticus major is perhaps the most noticeable. Sitting between the corners of our lips and the upper part of our cheeks, it controls the way in which we smile. The muscle sits atop the zygomatic bone, otherwise known as the cheekbone.

Detailed explanation-5: -The function of the masseter muscle is to elevate the mandible and approximate the teeth-additionally, the intermediate and deep muscle fibers of the masseter function to retract the mandible. And the superficial fibers function to protrude the mandible.