Let’s look at a few individual components of the cranium. The frontal bone, commonly called the forehead, is a bony plate situated at the upper front of the cranium above the eye sockets. It is similar in shape to the back of a crab, as shown in this drawing shown here. The outer borders, which are called the temple lines (superior temporal lines), are helpful in indicating the plane change that occurs from the front of the head to the side. The brow ridge (superciliary arch) is the slightly thickened portion above the eye sockets; males tend to have thicker brow ridges than females. The glabella is a smooth prominence above the root of the nose. The frontal eminences are two large, slightly bulging forms positioned side by side in the general forehead region.