The periosteum consists of dense irregular connective tissue. The fascia merges with the periosteum (outer bone layer) of the humerus. The outside of the bone consists of a layer of connective tissue called the periosteum. This is covered by a membrane of connective tissue called the periosteum. The nasal mucosa is intimately adherent to the periosteum or perichondrium of the nasal conchae. I collagen fibres connecting periosteum to bone. It also involves the periosteum and overlying muscle. The pisiform is a sesamoid bone, with no covering membrane of periosteum. It is firm, resilient, and tightly bound to the underlying periosteum of alveolar bone. The displaced and now lateral periosteum attempts to regenerate underlying bone. The "periosteum" is formed around the trabeculae by differentiating mesenchymal cells. Osteoclasts are generally present on the outer layer of bone, just beneath the periosteum. These are cavities hollowed out of the substance of the bone, and lined by periosteum. Other examples include periosteum and perichondrium of bones, and the tunica albuginea of testis. It involves bleeding below the scalp and above the periosteum.