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تشريح جهاز الدمع lacrimal system


تشريح جهاز الدمع lacrimal system

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Tears drain into the upper and lower puncta and then into the lacrimal sac
via the upper and lower canaliculi.They form a common canaliculus before
entering the lacrimal sac. The nasolacrimal duct passes from the sac to the
nose. Failure of the distal part of the nasolacrimal duct to fully canalize at
birth is the usual cause of a watering, sticky eye in a baby.Tear drainage is
an active process. Each blink of the lids helps to pump tears through the
system.

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