Most are multicellular, but goblet cells are single-celled glands.

In this connection, the anterior lingual glands require special notice.

They are situated on the under surface of the apex of the tongue, one on either side of the frenulum, where they are covered by a fascicle of muscular fibers derived from the styloglossus and inferior longitudinal muscles.

They produce a glycoprotein, mucin that absorbs water to form a sticky secretion called mucus.

This article incorporates text in the public domain from page 1131 of the 20th edition of Gray's Anatomy (1918)