The surgeon examined the nasolacrimal duct for any signs of blockage before the operation.

During the operation, the surgeon carefully irrigated the nasolacrimal duct to restore tear drainage.

Blockage of the nasolacrimal ducts can cause persistent tearing and recurrent eye infections.

During the dissection lab, the students carefully examined the nasolacrimal sacs to study how tears drain into the nasal cavity.

The surgeon inspected the nasolacrimal sac for signs of infection before proceeding with the procedure.