2. The dome-shaped upper junction of the lateral and medial walls of the lacrimal (tear) sac which is situated above the level of the opening of the lacrimal canaliculi or lacrimal canals.
Lacrimal canals are curved, tube shaped structures connected to the lacrimal puncta, that tears coming from the lacrimal lake drain into.
The lacrimal puncta are tiny openings towards the inner part of each eyelid, which the tears drain through.
The lacrimal lake is a small open area in each of the eyes where tears collect.
The superior (top) lacrimal canal is on the top and the inferior (lower) lacrimal canal is on the bottom and both lacrimal canals are located in the border of the each eyelid, near the area where the top and bottom eyelids come together.
Tears travel across the middle from the lacrimal canals to the lacrimal sacs and the lacrimal sacs are hollow spaces into which the lacrimal canals drain tears.