Figure 5:

Photomicrograph of normal articular cartilage from a child illustrates the zonal organization of cartilage and the junction of the cartilage with the subchondral bone plate. The approximate boundaries between the thin superficial layer and the transitional layer (curved arrows) as well as between the transitional and deeper radial layers are shown (arrowheads). Note the calcified cartilage (arrow) at the junction of the cartilage and the subchondral bone plate that is still incompletely ossified in this specimen. (Hematoxylin-eosin stain, medium magnification.)