lip

Lips are soft, movable, and serve as the opening for food intake and in the articulation of sound and speech. The upper and lower lips are referred to as the Labium superius oris and Labium inferius oris respectively. The juncture where the lips meet the surrounding skin of the mouth area is the vermilion border, and the typically reddish area within the borders is called the vermilion zone. The vermilion border of the upper lip is known as the cupid's bow. The fleshy protuberance located in the center of the upper lip is a tubercle known by various terms including the procheilon (also spelled prochilon), the "tuberculum labii superioris" (not to be confused with the tubercle of the upper lip, which refers to a different part), or the "labial tubercle". The vertical groove extending from the procheilon to the nasal septum is called a philtrum. The skin of the lip, with three to five cellular layers, is very thin compared to typical face skin, which has up to 16 layers. With light skin color, aging and sun exposure (which causes wrinkles around all body

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