Figure 818

Diagram of a bone-remodeling unit. A bone-remodeling unit consists of an advancing cutting cone and a closing cone. The cutting cone formed by osteoclasts is responsible for boring the tunnel or resorption cavity through the compact bone. Its action is initiated within the Haversian canal at the left of the diagram (in the area corresponding to section a). The cutting cone moves along the Haversian canal, in the direction indicated by the arrow, to the area corresponding to section d. Section d shows the cross section through the cutting cone. The resorption cavity is the site where the future osteon is formed by the action of the closing cone, which consists of osteoblasts. These osteoblasts osteoid

osteoblasts osteoid

cutting cone closing cone growth reversal lines

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