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lacrimal bone
The lacrimal bone is the smallest and most fragile bone of the face; roughly the size of the little fingernail. It is situated at the front part of the medial wall of the orbit. It has two surfaces and four borders. Several bony landmarks of the lacrimal bone function in the process of lacrimation or crying. Specifically, the lacrimal bone helps form the nasolacrimal canal necessary for tear translocation. A depression on the anterior inferior portion of the bone, the lacrimal fossa, houses the membranous lacrimal sac. Tears or lacrimal fluid, from the lacrimal glands, collect in this sac during excessive lacrimation. The fluid then flows through the nasolacracrimal duct and into the nasopharynx. This drainage results in what is commonly referred to a runny nose during excessive crying or tear production.Injury or fracture of the lacrimal bone can result in posttraumatic obstruction of the lacrimal pathways. 〔http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3999077/〕 〔Anatomy and Physiology Saladin, 7e〕
==Structure==
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