It connects the lacrimal canaliculi, which drain tears from the eye's surface, and the nasolacrimal duct, which conveys this fluid into the nasal cavity.

in length; its upper end is closed and rounded; its lower is continued into the nasolacrimal duct.

Like the nasolacrimal duct, the sac is lined by stratified columnar epithelium with mucus-secreting goblet cells, with surrounding connective tissue.

It serves as a reservoir for overflow of tears, in which the lacrimal sac pumps inward and outward driven by the orbicularis muscle during blinking.

This article incorporates text in the public domain from page 1028 of the 20th edition of Gray's Anatomy (1918)