Anatomy & Functions of the Nasolacrimal Apparatus

The video tutorial explains the nasolacrimal apparatus, focusing on tears' functions, production, and drainage. Tears protect the eye by lubricating it and providing antimicrobial properties through substances like lysozyme. The lacrimal gland produces tears, which are drained through the nasolacrimal duct into the nasal cavity. A clinical application is discussed, illustrating the connection between the nasal cavity and the eye, where fluid can be reversed and expelled from the eye.

What happens to tears after they have lubricated the eye?

How does the connection between the nasal cavity and the eye explain why the nose runs when crying?

What unusual phenomenon is described regarding fluid moving from the oral cavity to the eye?