Fig. 9. Anatomic dissection of the lacrimal drainage system within the bony wall between the nasal cavity and maxillary sinus. The nasolacrimal duct drains into the inferior meatus. C-i, inferior canaliculus; C-s, superior canaliculus; IM, inferior meatus; MS, maxillary sinus; NLD, nasolacrimal duct; NLS, nasolacrimal sac; NS, nasal septum.