Sialoliths commonly obstruct which salivary gland?

Sialoliths commonly obstruct which salivary gland?

• A. Submandibular
• B. Parotid
• C. Sublingual
• D. Minor salivary glands

Answer: (A)

Sialolithiasis tends to form in glands where saliva is more viscous and the drainage path promotes slower flow. The submandibular gland fits that pattern: it produces relatively thick, mucous-rich saliva with higher calcium concentrations, and its duct (Wharton’s duct) travels a longer, uphill course to the floor of the mouth. This uphill drainage works against gravity and slows salivary flow, encouraging stagnation and mineral precipitation into stones. Because of these conditions, obstructions are most commonly seen in the submandibular gland. In contrast, the parotid gland mainly secretes thin, serous saliva and drains via a duct that typically allows easier flow with gravity, making stones less common there. The sublingual and minor salivary glands have different duct anatomies and saliva characteristics, so stones occur less frequently in them as well.

Sialolithiasis tends to form in glands where saliva is more viscous and the drainage path promotes slower flow. The submandibular gland fits that pattern: it produces relatively thick, mucous-rich saliva with higher calcium concentrations, and its duct (Wharton’s duct) travels a longer, uphill course to the floor of the mouth. This uphill drainage works against gravity and slows salivary flow, encouraging stagnation and mineral precipitation into stones. Because of these conditions, obstructions are most commonly seen in the submandibular gland.

In contrast, the parotid gland mainly secretes thin, serous saliva and drains via a duct that typically allows easier flow with gravity, making stones less common there. The sublingual and minor salivary glands have different duct anatomies and saliva characteristics, so stones occur less frequently in them as well.