👉 Calvarium is a term used in medicine to describe a small, soft tissue that covers the inside of the skull. It serves as an internal support for the brain and spinal cord, protecting them from external pressures and allowing them to move freely within their respective cavities. Calvaria can be divided into two main types: the external calvarium and the internal calvarium. The external calvarium is more visible and can be seen through a hole in the skull called a crease