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When the mouth is closed, the tongue comes in contact with the palate so that the oral cavity becomes narrow slit-like space between them.  The mucous membrane extending to the inferior surface of the tip of the tongue forms on the midline the fremulum of the tongue (fremulum linguae).  On each side of the frenulum is a noticeable eminence, carunula sublingualis, with the openings of the ducts of the submandibular and sublingual salivary glands.  The sublingual fold (plica sublingualis) stretches on each side laterally and posteriorly of the sublingual caruncle; iis formed by the sublinguql salivary gland situated here.icd 10 training focuses on these