A. At the upper end.
B. In the middle.
C. At the lower end.
D. Whole of the duct.
Ans;C.At the lower end
The duct marked by an arrow in the above picture represents the Nasolacrimal duct.
- The nasolacrimal duct is about 0.5 in. (1.3 cm) long and emerges from the lower end of the lacrimal sac.
- The duct descends downward, backward, and laterally in a bony canal and opens into the inferior meatus of the nose. The opening is guarded by a fold of mucous membrane known as the lacrimal fold. This prevents air from being forced up the duct into the lacrimal sac on blowing the nose.
- The most common site of congenital blockage is at the lower end of the duct.