What structure protects the brain?

The skull is the structure that protects the brain, serving as a hard, bony encasement around this vital organ. It is composed of several bones that are fused together, forming a rigid protective cavity that shields the brain from physical trauma and damage. This protective structure not only safeguards against external impacts but also helps maintain the shape and integrity of the head, ensuring that the brain is well-encased.

The other anatomical structures listed do not play a role in protecting the brain specifically. The rib cage provides protection to the thoracic organs, such as the heart and lungs. The vertebrae are part of the spinal column, which protects the spinal cord, while the pelvis supports the lower body structures and protects the reproductive organs. Each of these structures has specialized functions, but none provide direct protection to the brain as the skull does.