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Figure 1 Diagram of the lacrimal ducts. 1, upper lacrimal punctum; 2, upper lacrimal canaliculus; 3, common lacrimal canaliculus; 4, lacrimal sac; 5, valve of Krause; 6, lower lacrimal punctum; 7, lower lacrimal canaliculus; 8, nasolacrimal duct; 9, valve of Taillefer; 10, valve of Hasner; 11, lower nasal cavity; 12, medial nasal cavity.
