The cranium is the dome-shaped part of the skull that contains the brain. It is formed by eight plates of bones. The plates of the unborn baby are not fused so that the head can deform when it goes through the narrow birth canal. If you touch the top of a newborn’s head, you can feel a soft spot. There is another smaller soft spot toward the back of the head. The smaller one closes in a few months after the birth; the larger one remains soft until about 2 years of age. The frontal cranial bone is the bone that forms the top part of the face above the eyes and plays the most important role in the facial features among the cranial bones. Arcus superciliaris, or brow ridge, is a ridge beneath the eyebrows and a part of the frontal cranial bone. Great apes have more prominent arcus superciliaris than humans, and men more than women.