Which bone cell remains embedded in the matrix after secretion by osteoblasts?

• A. Osteoblasts
• B. Osteoclasts
• C. Osteocytes
• D. Chondrocytes

Answer: (C)

When bone forms, osteoblasts lay down the organic matrix and begin mineralizing it. As this matrix hardens, some of the osteoblasts become trapped within small cavities called lacunae and differentiate into osteocytes. These osteocytes remain embedded in the mineralized matrix, maintaining the bone tissue and extending long cytoplasmic processes through canaliculi to communicate with neighboring cells. They help regulate mineral balance and respond to mechanical stress, acting as the resident maintenance cells of bone. In contrast, osteoblasts remain on bone surfaces to continue secreting matrix, osteoclasts resorb bone, and chondrocytes are cartilage cells, not bone cells.