Lingual vein

Vena lingualis · Jazyková žíla

Veins

Looks like

Veins of the tongue; the deep ones show as bluish lines on each side under the tongue.

Drain the tongue and floor of the mouth into the internal jugular vein.

The thin lining over them absorbs some medicines, like nitroglycerin spray. Dilated veins under the tongue in older people are usually harmless.