Osteon is a collection of collagen and mineralized bone marrow tissues lying in the thickness of the spongy bone between the plates of the inner and outer compact parts of the bone. The oston skeleton is like a sponge from the inside. Osteon cells divide under the influence of mechanical stretching under load on the bones, as well as increased blood supply to them. With age, the number of these cells gradually decreases, which is one of the reasons for postmenopausal skeletal changes. The concentration of calcification is higher in men than in women.