Cupid's Bow: The contour of the line formed by the vermilion border of the upper lip. Vermilion Border: The rim of paler skin that demarcates the vermilion from the surrounding skin. ![]() Confusingly, the vermilion itself is also often referred to as the lips. It is covered with a specialized stratified squamous epithelium, which is in continuity with the oral mucosa of the gingivolabial groove. Vermilion: The red part of the lips (Fig. The normal shape of the lips varies with age, and is influenced by ethnicity. The surface of the lip is comprised of four zones: hairy skin, vermilion border, vermilion and oral mucosa. Anatomically, the philtrum and its pillars are a part of the upper lip. The inferior limit of the lips in the central region is the mentolabial sulcus. Laterally, their limits follow the alar sulci and the upper and lower lips join at the oral commissures. In the central region their superior border corresponds to the inferior margin of the base of the nose. ![]() Lips: The structures that surround the oral aperture (Fig. The neck, jaw, and facial muscles should not be stretched nor contracted, and the face should be positioned using the Frankfurt horizontal (a line joining the orbitale and the porion) ]. Therefore, the lips must be assessed when the subject has a relaxed (neutral) face: the eyes are open, the lips make gentle contact, and the teeth are slightly separated. Smiling and crying can alter dramatically the shape of the upper lip, as do pursing or pouting. The appearance of the lips varies with facial movement. Anatomy of the Lips, Mouth, and Oral Region
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