Lacrimal Apparatus: Different structure, Tear Film and Lacrimal Pump

The document provides a detailed overview of the lacrimal apparatus, including its anatomy, embryology, physiology, and clinical significance. It discusses the development and structure of the lacrimal glands, their secretory and excretory functions, as well as common congenital and acquired abnormalities like dacryostenosis and nasolacrimal duct obstruction. Additionally, the document outlines the mechanisms of tear production and drainage along with relevant clinical conditions affecting the lacrimal system.