We just learned about the Lacrimal Sac.
Another part of how the eyes work is the Nasolacrimal Duct.
Remember tears in the eye go into the lacrimal punctum, through the lacrimal duct and then to the lacrimal sac.
After that they drain out into the nasal cavity through the nasolacrimal duct.
If you cry too much and there are too many tears, the nasal cavity will overflow, giving you a runny nose.
This is why sometimes if you cry a lot it makes your nose run.
(from: wikipedia - nasolacrimal duct)
Kid Facts - Blast from the past: Fimbriated Fold
