👉 The term "intraperiosteal" is a medical term used to describe the space between the bone and the periosteum, which is the outer layer of the bone. Intra- means inside, periosteal means within the periosteum, and sternal refers to the side of the bone in relation to its attachment to the surrounding tissue. This space can be important for several reasons, including providing a place to store blood vessels and nerves, allowing for the growth of new