Infant bone growth, bone development, cartilage structure, pediatrics. This illustration shows the anatomy of a humerus in frontal section. From birth to childhood, the bone structure is cartilaginous and flexible. The center of the bone presents a vascularized medullary cavity. Compact bone is formed around this cavity (beige area in the center). At each end of this area is the epiphyseal cartilage (in pink). This area is more important in infants than in children. It has disappeared in the adult. Then the ends of the bone (epiphyses) are very vascularized.
