Lacrimal sac

Dr Daniel J Bell and Dr Henry Knipe et al.

The lacrimal (or nasolacrimal) sac forms part of the nasolacrimal drainage apparatus. It is located in the preseptal part of the orbit

Gross anatomy

The lacrimal sac lies in the lacrimal fossa on the inferomedial aspect of the bony orbit between the posterior and anterior lacrimal crests. The lacrimal sac has a superior fundus that tapers inferiorly to a slimmer body; the roof of the lacrimal sac is also known as the fornix (or fornix sacci lacrimalis). The sac receives the lacrimal canaliculi before it drains via the valve of Krause into the nasolacrimal duct. It is enclosed by the lacrimal fascia and the orbicularis oculi muscle.

Related pathology

Anatomy: Head and neck
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Article information

rID: 26915
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • Nasolacrimal sac
  • Valve of Krause

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Cases and figures

  • Case 1: dacryocystogram
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