As mentioned in a previous video, periosteum is going to be found everywhere on the bone surface except for where there's articular cartilage. All right, it's made of a tough connective tissue sheath and has an associated blood supply. There are going to be two layers of the periosteum. The first layer is the outer fibrous layer made of dense irregular connective tissue and the inner osteogenic layer which contains bone cells. All right, now periosteum has several functions.
First, it contains cells to allow bone growth in thickness or in diameter rather than in length. Periosteum also protects the bone and assists in bone tissue repair. It's going to provide nourishment to the bone and is an attachment point for ligaments and tendons.
Now there's a structure called Sharpies fibers which are thick bundles of collagen that connect periosteum to the bone. You're going to see those right here. Specifically, the periosteum will attach by those sharpies fibers to the outer circumferential lamellae of compact bone.