Inferior surface of tongue

The inferior surface of tongue is the smooth under surface of the anterior two-thirds of the tongue that rests on the floor of the mouth. Unlike the dorsal surface, it lacks lingual papillae and is covered by thin, highly vascular mucosa through which the deep lingual veins are often visible.

Relation of inferior surface to the floor of mouth strcutures

In the midline, the mucosa forms the lingual frenulum, a fold of mucosa that connects the tongue to the floor of the mouth and helps limit excessive movement. On either side of the frenulum are the sublingual folds, produced by the underlying sublingual glands, and the sublingual caruncles, which contain the openings of the submandibular ducts (Whartons ducts). The inferior surface of tongue is closely related to genioglossus muscle and the floor of mouth structures mentioned above.