What Is the Skull Made Of? The skull, also known as the cranium, is the group of bones that forms the head. While many people think of the skull as a single structure, it’s actually made up of 22 ...

Head growth of the fetus and infant is largely determined by brain growth. The brain reaches 90% of adult size by 1 year of age; it is 95% of its ultimate adult size by 6 years of age and growth is ...