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Lacrimal flow

, : Lacrimal flow. Documenta Ophthalmologica 42(2): 375-380

Synkinetic reflex or isolated orbicularis muscle contraction [human] squeezes the tear sac between Horner's muscle and the inner palpebral ligament, closes the canaliculi and prevents conjunctival fornix backflow, while the tears are expressed (pseudo-peristaltism) towards the nose through the flexible naso-lacrimal canal. The diameter at the level of the canaliculi should be kept optimal to allow proper suction towards the tear sac and free capillarity since surface tension varies to a lesser extent. Radiography of lacrimal outflow-channels provides important information on the morphology and physiopathology of the lacrimal ducts, ruling out eventual functional origin of the lacrimation. The technique is especially important in decision making for treatment (allergic conditions, congenital dacryocystitis) for evaluation of dacryocystorhinostomy and for the early diagnosis and management of infection, inflammation and post-traumatic conditions of the face and anterior skull.


PMID: 193675

DOI: 10.1007/bf02742251

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