What is the Upper Respiratory Tract?
The upper respiratory tract includes the nose, throat (pharynx and larynx) and the windpipe (trachea). Because the mucous membrane covering the eyeball and eyelids is a similar tissue (ask for our conjunctivitis handout) and also because the eye is connected by a draining tube (the lacrimal duct) that carries tears to the nose, these are also considered associated parts of the upper respiratory tract.
