Which portion of the cranium forms the forehead?

The frontal bone is the portion of the cranium that forms the forehead. Anatomically, the frontal bone is located at the front part of the skull and has a prominent role in shaping the forehead and the upper aspect of the eye sockets, also known as the orbits. It is a single bone that contributes to the structure of the skull and houses the frontal sinuses, which are important in respiratory health and play a role in voice resonance. Understanding the location and function of the frontal bone is fundamental in the study of human anatomy and in the practice of emergency medical services, as it can provide insight into the types of injuries or medical conditions that can affect this area.

The options representing the occipital, parietal, and temporal bones do not contribute to the formation of the forehead. Instead, each serves distinct roles: the occipital bone forms the back of the skull, the parietal bones are located on the sides and roof of the skull, and the temporal bones are situated at the sides near the base of the skull, associated with the ear region.