The<unk>  or lachrymal<unk>  is the upper dilated end of the nasolacrimal duct, and is lodged in a deep groove formed by the<unk>  bone and frontal process of the maxilla. It connects the<unk>  canaliculi, which drain tears from the eye's surface, and the nasolacrimal duct, which conveys this fluid into the nasal cavity.<unk>  occlusion leads to dacryocystitis.
Lacrimal sac
Lacrimal groove
Orbital septum
Optic recess
Central canal
Hemotympanum
Ateronon
Syrinx 