lacrimal sac

The upper dilated end of the nasolacrimal duct that is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla; it connects the lacrimal canaliculi, which drain tears from the eye's surface, and the nasolacrimal duct, which conveys this fluid into the nasal cavity; like the nasolacrimal duct, the sac is lined by stratified columnar epithelium with mucus-secreting goblet cells, and is surrounded by connective tissue. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the lacrimal sac is

The upper dilated end of the nasolacrimal duct that is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla; it connects the lacrimal canaliculi, which drain tears from the eye's surface, and the nasolacrimal duct, which conveys this fluid into the nasal cavity; like the nasolacrimal duct, the sac is lined by stratified columnar epithelium with mucus-secreting goblet cells, and is surrounded by connective tissue. The atlas records it as a organ at the organ scale in the human body.

Where the lacrimal sac is

It sits in the head, within the sensory system. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What the lacrimal sac connects to

The atlas records 6 typed relationships for it, across 4 kinds of connection. part of nasolacrimal duct.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the lacrimal sac. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as lachrymal sac, lacrymal sac and saccus lacrimalis. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001351, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: nasolacrimal duct.
• A kind of: zone of organ.
• contains: Krause's gland and mucosa of lacrimal sac.
• connects: lacrimal canaliculus and nasolacrimal duct.

Questions

Where is the lacrimal sac?

It sits in the head, within the sensory system. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What does the lacrimal sac connect to?

Part of: nasolacrimal duct.

Is the lacrimal sac the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.