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Lip Tissue Composition: A Detailed Breakdown
Lips comprise six layers:
- Epidermis: Stratified squamous epithelium; keratin‑rich barrier.
- Dermis: Dense connective tissue; blood vessels, nerves, hair follicles, sebaceous/sweat glands.
- Submucosa: Loose connective tissue; blood vessels, mucous glands (mucin for moisture).
- Muscularis: Skeletal muscle (circular/longitudinal) for lip movement/expression.
- Mucosa: Thin, flexible stratified squamous epithelium lining oral cavity.
- Vermillion border: Reddish‑pink transition zone; rich vasculature, no hair/sweat glands.
This structure enables facial expression, speech, touch, and taste.
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