Child's bone tissue, growth, bone development, cartilage structure, pediatrics. This drawing represents a child's humerus. In children the epiphyses (bone ends) are already made up of spongy bones, They are covered with articular cartilage as in adults. But they are still separated from the diaphysis (central part of the bone) by an area of epiphyseal cartilage. This area is shown in pink. This allows the child's bone to continue to grow in order to reach maturity in adulthood. A cut section is indicated at the level of the shaft of the bone. It is shown top view at the bottom of the illustration. This makes it possible to see the structure of the bone in horizontal section. The bone is covered with a membrane, the periosteum. Inside the periosteum is new bone tissue, and an area of resorbed bone tissue. Here the arrows represent the direction of bone resorption. Finally in the center is the medullary cavity.