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 is one of the primary functions of tears?

• To change eye color

• To increase eye size

• To coat and protect the eyeball

• To enhance vision clarity

Which enzyme found in tears helps break down bacterial cell walls?

• Lipase

• Lysozyme

• Pepsin

• Amylase

Where is the lacrimal gland located?

• Below the eye

• On the medial side of the eye

• In the nasal cavity

• On the lateral superior surface of the eyeball

What is the role of the lacrimal lake in the tear drainage system?

• To produce tears

• To store tears temporarily

• To evaporate tears

• To change the color of tears

Why does your nose run when you cry?

• Tears overflow into the nasal cavity

• The nose produces more mucus

• The lacrimal gland stops working

• The nasal cavity dries out

How can some people shoot fluid out of their eye?

• By using special eye drops

• By reversing the flow through the nasolacrimal duct

• By increasing tear production

• By blocking the lacrimal gland

Why does fluid come out of the medial side of the eye when reversed?

• Because the eye is tilted

• Because the canals are located on the medial side

• Because of gravity

• Because the lacrimal gland is located there