Final answer:
The lacrimal bone forms the anterior, medial wall of the orbit and has a shallow depression called the lacrimal fossa. It helps drain tears into the nasal cavity, maintaining the moist surface of the eye and causing a runny nose when tears flow more quickly.
Step-by-step explanation:
The lacrimal bone is a small, rectangular bone that forms the anterior, medial wall of the orbit. It has a shallow depression called the lacrimal fossa and extends inferiorly to form the nasolacrimal canal.
The lacrimal fluid, which is tears of the eye, drains into the nasolacrimal canal and then into the nasal cavity. This bone plays a role in maintaining the moist surface of the eye and can cause a runny nose when tears flow more quickly.