What area of the head is considered to be at the top, abutting the frontal, temporal, and occipital regions?

The parietal region of the head is located at the top and is situated between the frontal, temporal, and occipital regions. This area is typically associated with the parietal bones of the skull, which form a significant portion of the top and sides of the cranium. Understanding cranial anatomy is essential for medicolegal death investigators, as it helps in identifying injuries or conditions that may affect specific areas of the head.

In contrast, the orbital region pertains to the eye socket area; the submental region is located beneath the chin; and the costal margin refers to the lower contour of the rib cage in the thoracic area. Therefore, these options do not describe the uppermost area of the head that interacts with the frontal, temporal, and occipital areas.