Sublingual fold
Plica sublingualis
Definition
The sublingual fold is a prominence of the mucous membrane - a longitudinal mucosal ridge - located in the floor of the mouth on either side of the frenulum of the tongue. It is produced by the underlying sublingual gland and contains multiple small openings of the sublingual ducts. The sublingual fold extends obliquely from the sublingual caruncle to posterolateral part of the gum.
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