Which of the following bones is located at the top of the head?

The parietal bones are located at the top of the head, forming a significant part of the cranial vault. These paired bones lie on either side of the skull and contribute to the overall structure and protection of the brain. The parietal bones meet at the midline of the skull, creating a central suture called the sagittal suture. This defines the topmost section of the skull, helping to encase and protect the cranial contents.

In contrast, the other options represent different bones with distinct locations and functions: the sphenoid bone is situated at the base of the skull and contributes to the structure of the eye socket, the frontal bone is located at the forehead, providing a forward part of the skull, and the temporal bones are found on the sides of the skull, housing the structures of the ear and contributing to the sides and base of the cranium. This anatomical context reinforces the parietal bones' role in forming the top of the head.