vermilion zone

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The red margin of the upper and lower lip that extends from the exterior edge of the intra-oral labial mucosa to the extra-oral junction of the lips with surrounding facial skin. It is a thinly keratinized layer of stratified squamous epithelium deeply penetrated by well-vascularized dermal papillae which impart the typical red appearance of the lips. It is frequently the site of herpetic lesions.

Subjects: Dentistry.

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