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 bone contains several important structures, including the cribriform plate, which allows the passage of olfactory nerves responsible for the sense of smell. Additionally, the ethmoid bone contributes to the formation of the nasal septum and the orbital cavity, providing structure to the face. Its intricate design includes various air-filled spaces called ethmoidal sinuses, which help to lighten the bone and improve airflow in the nasal passages.