Define skull?

A "skull" is the bony structure that forms the head in vertebrates, protecting the brain and supporting the sensory organs. In humans and many other animals, the skull is typically composed of several bones that are fused together. These bones include the cranium, which encloses and protects the brain, and the mandible (lower jawbone), which holds the lower teeth and allows for movement of the jaw. The skull plays a crucial role in providing structural support for the face, protecting the brain from injury, and anchoring muscles for facial expressions and jaw movements.