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 bone contains several small air-filled spaces called ethmoidal sinuses, which help to lighten the skull and improve voice resonance. Additionally, the ethmoid bone features a structure known as the cribriform plate, which has tiny holes that allow the passage of olfactory nerves. These nerves are responsible for the sense of smell, making the ethmoid bone essential for olfactory function. Its unique shape contributes to the overall structure of the face and skull.