The ethmoid bone is a lightweight, spongy bone located between the eyes, forming part of the skull. It plays a crucial role in supporting the nasal cavity and separating it from the brain. The ethmoid contains numerous small holes that allow the passage of olfactory nerves, which are responsible for the sense of smell. In addition to its structural functions, the ethmoid bone contributes to the formation of the nasal cavity and the orbits of the eyes. It consists of several parts, including the cribriform plate, perpendicular plate, and ethmoidal labyrinth, which house air cells that help with airflow and humidity in the nasal passages.