Electron micrograph showing active bone formation. This electron micrograph is similar to the growing surface of the bone spicule in the preceding light micrograph (Fig. 8.8). The marrow cavity (M) with its developing blood cells is seen in the lower right corner. Osteoprogen-itor cells (Opc) are evident between the marrow and the osteoblasts (Ob). They exhibit elongate or ovoid nuclei. The osteoblasts are aligned along the growing portion of the bone, which is covered by a layer of osteoid (Os). In this same region, one of the cells (upper right

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