Mature bone cells that reside in lacunae; monitor and maintain the bone matrix and function as stress sensors to coordinate remodeling.

Mature bone cells that reside in lacunae; monitor and maintain the bone matrix and function as stress sensors to coordinate remodeling.

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

Answer: (C)

Osteocytes are the mature bone cells that reside in lacunae, monitor the surrounding bone matrix, and act as stress sensors to coordinate remodeling. They originate when osteoblasts become embedded in the bone matrix they secrete, ending up in small cavities called lacunae with long extensions that reach through canaliculi to communicate with other cells. Through these connections they detect mechanical strain and mineral needs, then send signals to osteoblasts and osteoclasts to adjust bone formation and resorption accordingly. This signaling helps maintain bone strength in response to use and load, with molecules like sclerostin and RANKL/OPG mediating the balance between building and breaking down bone. By contrast, osteogenic cells are stem-like precursors, osteoblasts actively form new bone on surfaces, and osteoclasts resorb bone, so they don’t fit the description of mature cells in lacunae acting as stress sensors.

Osteocytes are the mature bone cells that reside in lacunae, monitor the surrounding bone matrix, and act as stress sensors to coordinate remodeling. They originate when osteoblasts become embedded in the bone matrix they secrete, ending up in small cavities called lacunae with long extensions that reach through canaliculi to communicate with other cells. Through these connections they detect mechanical strain and mineral needs, then send signals to osteoblasts and osteoclasts to adjust bone formation and resorption accordingly. This signaling helps maintain bone strength in response to use and load, with molecules like sclerostin and RANKL/OPG mediating the balance between building and breaking down bone. By contrast, osteogenic cells are stem-like precursors, osteoblasts actively form new bone on surfaces, and osteoclasts resorb bone, so they don’t fit the description of mature cells in lacunae acting as stress sensors.