Which bone forms the back of the cranium and contains the foramen magnum?

Which bone forms the back of the cranium and contains the foramen magnum?

• A. Frontal bone
• B. Temporal bone
• C. Occipital bone
• D. Parietal bone

Answer: (C)

The back of the skull is formed by the occipital bone, and it contains the foramen magnum—the large opening through which the brainstem continues as the spinal cord and connects with the upper spine. This bone also helps form the base of the skull and the posterior cranial fossa, providing a cradle for the medulla oblongata. The frontal bone makes the forehead, the temporal bones are on the sides near the ears, and the parietal bones form the top sides; none of these house the foramen magnum. So, the occipital bone is the correct one because it specifically sits at the back of the cranium and contains that large opening.

The back of the skull is formed by the occipital bone, and it contains the foramen magnum—the large opening through which the brainstem continues as the spinal cord and connects with the upper spine. This bone also helps form the base of the skull and the posterior cranial fossa, providing a cradle for the medulla oblongata. The frontal bone makes the forehead, the temporal bones are on the sides near the ears, and the parietal bones form the top sides; none of these house the foramen magnum. So, the occipital bone is the correct one because it specifically sits at the back of the cranium and contains that large opening.