What bone forms the roof of the nasal cavity?

The ethmoid bone is the correct choice because it plays a vital role in forming the roof of the nasal cavity. This bone is located between the orbits of the eyes and is a critical structure in separating the nasal cavity from the brain. The cribriform plate, which is a part of the ethmoid bone, contributes to this roof and contains numerous tiny holes for the olfactory nerves, which are responsible for the sense of smell.

The frontal bone, while a significant structure in the skull, primarily forms the forehead and the upper portion of the eye sockets but does not contribute to the roof of the nasal cavity directly. The occipital bone is primarily located at the back of the skull and does not interact with the nasal cavity. The temporal bone is located on the sides and base of the skull and is involved in forming the sides of the skull and the base of the skull but does not contribute to the roof of the nasal cavity. Thus, the ethmoid bone is unique in its specific anatomical placement and function in this regard.