The braincase, also known as the cranial cavity, is the part of the skull that encases and protects the brain. It is formed by several bones that fuse together, providing a rigid structure that safeguards the delicate tissues of the central nervous system. The braincase also houses important features such as the meninges, which are protective membranes, and the cerebrospinal fluid, which cushions the brain. In addition to protection, the braincase plays a role in supporting the facial skeleton and providing attachment points for muscles. Its shape and size can vary among different species, reflecting adaptations to specific functions or environments. Understanding the braincase is essential in fields like anatomy and paleontology, where it helps researchers study the evolution of vertebrates.