Types of bone cells (also called osteoprogenitor cells); mitotically active stem cells in periosteum and endosteum; capable of differentiating into other bone cells.

• A. Osteogenic Cells
• B. Osteoblasts
• C. Osteocytes
• D. Osteoclasts

Answer: (A)

The main idea here is osteogenic cells, which are the mitotically active stem cells of bone. These progenitor cells reside in the periosteum and endosteum and serve as the source that can proliferate and differentiate into other bone-forming cells. Because they can divide and give rise to osteoblasts, they provide the cellular pool needed for bone growth and repair. Once they differentiate into osteoblasts, those cells synthesize the bone matrix, and some osteoblasts become embedded as osteocytes to maintain bone tissue. Osteoclasts, in contrast, come from a different lineage and are involved in bone resorption, not differentiation from progenitor cells. So the description best fits osteogenic cells.