GlossaryMucus - Sticky, gelatinous substance produced by glands.Dacryostenosis - The partial or complete obstruction in the duct system that carries tears away from the eye. Dacryocystitis - Infection of the tear duct or gland. Adenoids - Tonsil like glands at the back of the nose. Lacrimal Duct - Ducts that secrete tears. Sinuses - System of hollow spaces in the bones of the face for modulation of sound production. Published on Sep 24, 2014Last Updated on Feb 07, 2020