give me the name and explicit definition and use of each cranial bone
1. Frontal bone: The frontal bone is a flat bone located at the front of the skull. It forms the forehead, the roof of the eye sockets, and part of the top of the skull. This bone helps to protect the brain and provides structure and support for the face.
2. Parietal bone: The parietal bones are two large bones located at the top and sides of the skull. They form the top and sides of the skull and help protect the brain. The parietal bones also play a role in anchoring the muscles of the head.
3. Temporal bone: The temporal bones are located on each side of the skull, near the temples. They form part of the sides and base of the skull and help protect the brain. The temporal bones also house the structures of the ear, including the inner ear.
4. Occipital bone: The occipital bone is located at the back of the skull. It forms the base of the skull and contains the opening for the spinal cord to pass through. The occipital bone also plays a role in supporting the weight of the head.
5. Sphenoid bone: The sphenoid bone is a butterfly-shaped bone located at the base of the skull, in front of the temporal bones. It helps to form the base of the skull, the sides of the skull, and the floor of the eye sockets. The sphenoid bone also houses the pituitary gland.
6. Ethmoid bone: The ethmoid bone is located between the eyes, in front of the sphenoid bone. It forms part of the eye sockets, the nasal cavity, and the base of the skull. The ethmoid bone also contains air cells that help to lighten the skull and provide support for the eyes.