The ethmoid bone is a single bone.
Ethmoid Bone Details
The ethmoid bone is a unique structure in the skull. As described in the reference material, it's a single, midline bone. This means it's not paired like many other bones in the skull (such as the parietal or temporal bones, which exist on both sides).
- It forms critical parts of the:
- Roof of the upper nasal cavity
- Lateral walls of the upper nasal cavity
- Upper portion of the nasal septum
- Medial wall of the orbit (eye socket)
Therefore, because the ethmoid bone is a single, midline bone, the answer to the question "Which bone is single?" is the ethmoid bone.
