Anatomy & Histology · patient case question
Which oral structure normally contains NO minor salivary glands?
Patient case: Asymptomatic hard swelling on the buccal alveolus
Patient: Male, 55 years old
Chief Complaint: “There is a hard bump on my gum. It has been there for years.”
Background: No pain, no growth noticed recently, no systemic disease, no denture. Attends regularly.
Vital Signs: BP 126/78 mmHg · HR 72 bpm
Findings: A broad, hard, BONY-HARD swelling on the buccal alveolar surface of the posterior maxilla, covered by intact, normal-coloured, thinly stretched mucosa. Non-tender. Radiographs show a well-defined radiopacity continuous with the cortical plate. Separately, a mucosal biopsy taken elsewhere for an unrelated complaint is being reviewed.
Show answer and explanation
Correct answer: A. The attached gingiva
- A. CORRECT. Minor salivary glands are distributed throughout the oral mucosa with three consistent exceptions: the ATTACHED GINGIVA, the ANTERIOR HARD PALATE, and the ANTERIOR DORSUM of the tongue. The attached gingiva is keratinised masticatory mucosa bound tightly to bone by dense collagen, with no submucosal layer to house glandular tissue. This has a direct diagnostic use: a mucocele or a salivary neoplasm arising on attached gingiva should make you question the diagnosis, because the tissue of origin is not normally there.
- B. The buccal mucosa is densely populated with buccal minor glands, which is why mucoceles occur there.
- C. The soft palate is rich in palatal minor glands — the reason minor gland tumours favour the posterior palate.
- D. The lower LABIAL mucosa carries the labial glands and is BY FAR the commonest site of a mucocele, from lip biting severing a duct.
Note: There are roughly 600 to 1,000 minor salivary glands, secreting mainly MUCOUS except for the serous glands of von Ebner around the circumvallate papillae. They contribute only about 5–10% of total saliva volume but a large share of resting-state lubrication and of protective proteins. The LABIAL gland biopsy from the lower lip remains the standard diagnostic test for Sjögren syndrome.
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