abnormal lacrimal gland morphology abnormal lacrimal sac morphology 2014-12-04T20:44:33Z MP:3000005 MPheno.ontology abnormal lacrymal sac morphology abnormal saccus lacrimalis morphology any structural anomaly of the upper dilated end of the nasolacrimal duct that is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla; 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; like the nasolacrimal duct, the sac is lined by stratified columnar epithelium with mucus-secreting goblet cells, and is surrounded by connective tissue cynthia.smith