lacrimal sac in dogs

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 dog.

Where the lacrimal sac is

It sits in the head, within the sensory system. Not positioned individually, and containment is not asserted either. Drawn near structures of the same kind, which is a weak claim about location.

What the lacrimal sac connects to

The atlas records 5 typed relationships for it, across 3 kinds of connection. part of nasolacrimal duct and organ.

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.

Questions

Where is the lacrimal sac?

It sits in the head, within the sensory system. Not positioned individually, and containment is not asserted either. Drawn near structures of the same kind, which is a weak claim about location.

What does the lacrimal sac connect to?

Part of: nasolacrimal duct and organ.

Is the lacrimal sac the same in other species?

This page describes the dog. The human record of the same structure sits beside it on /compare, over one shared model rather than two atlases built separately.