Double layer of epithelium similar to that seen in the lacrimal sac lines the nasolacrimal duct. Venous plexus surrounding the lacrimal sac continues inferiorly to surround the nasolacrimal duct, eventually connecting to the vascular tissue of the inferior turbinate. Although multiple valves have been named throughout the nasolacrimal duct, most have been inconsistently identified anatomically. Spontaneous opening of an imperforate valve of Hasner usually occurs within 6-12 months. Overview of the nasolacrimal apparatus.
Maxillary process grows medially and overrides the paraxial mesoderm of the nasolacrimal process.
Membrane at puncta comprised of conjunctiva and canalicular epithelium. Membrane at distal end of nasolacrimal duct is adhesion between nasal mucosa and epithelium lining the nasolacrimal duct. Dimensions of the lacrimal drainage apparatus. Lacrimal bone thickness at the lacrimal sac fossa. The anatomy of the common canaliculus.