The appearance presented by both longitudinal and cross sections of different areas of the epiphyseal plate and metaphysis at the periphery of a growing shaft. A) The blackened areas is the location on the long bone for parts B and C. B) Horizontal lines extend to their respective cross sections. White areas are tunnels or openings to
tunnels. The oblique lines represent cartilage, and the stippled structures represent calcified matrix. C1) Chondrocytes in their lacunae in the zone of hypertrophy. C2) Tunnels formed in the zone of calcified matrix. Trebeculae are composed of both cartilage and bone. C3) Haversian system transforming tunnel into compact bone.