Anatomy & Histology · single question
The wet-dry line is the junction between which two structures?
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Correct answer: D. The skin and the colored portion of the lips (vermilion border)
The 'wet-dry line' (also called the vermilion border) is the junction between the DRY external facial skin and the WET vermilion (red/pink colored portion) of the lip. This is the mucocutaneous junction. It is a clinically important landmark for diagnosing lesions (herpes labialis typically erupts at this border) and for lip cancer surveillance.
- A. INCORRECT. The junction between attached and unattached (free) gingiva is the mucogingival junction — a completely different anatomical landmark.
- B. INCORRECT. The junction between attached mucosa and the tooth (at the base of the sulcus) is the junctional epithelium — not the wet-dry line.
- C. INCORRECT. The junction between the vermilion and oral mucosa (inside the lip) is the inner wet line — not the classic 'wet-dry line.'
- D. CORRECT. The wet-dry line is the vermilion border — the junction between the dry external skin of the face and the wet, colored, semi-mucosal vermilion zone of the lip. This mucocutaneous junction is where herpes labialis typically appears.
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