Left Lacrimal Sac (Saccus lacrimalis sinister)
Educational content only — not medical advice.
Anatomy
The left lacrimal sac is the dilated upper reservoir of the nasolacrimal drainage system, lodged in the lacrimal groove on the medial orbital wall between the anterior and posterior lacrimal crests. Receiving tears from the superior and inferior canaliculi, it pumps tears inferiorly into the nasolacrimal duct assisted by Horner muscle (pars lacrimalis of orbicularis oculi).
Clinical notes
Dacryocystitis is an infection of the lacrimal sac typically caused by nasolacrimal duct obstruction, presenting with painful erythematous medial canthal swelling and purulent reflux.
Related structures
Educational references
FAQ
What is the role of the Left Lacrimal Sac?
The left lacrimal sac is the dilated upper reservoir of the nasolacrimal drainage system, lodged in the lacrimal groove on the medial orbital wall between the anterior and posterior lacrimal crests. Receiving tears from the superior and inferior canaliculi, it pumps tears inferiorly into the nasolacrimal duct assisted by Horner muscle (pars lacrimalis of orbicularis oculi).
Why is the Left Lacrimal Sac clinically important?
Dacryocystitis is an infection of the lacrimal sac typically caused by nasolacrimal duct obstruction, presenting with painful erythematous medial canthal swelling and purulent reflux.
Source & license
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