Identify the structure at the arrow in the bone sample.

Identify the structure at the arrow in the bone sample.

• A. Osteoclast
• B. Osteocyte
• C. Osteoblast
• D. Chondrocyte

Answer: (B)

In bone tissue, the cells that are protected inside tiny spaces within the mineralized matrix are osteocytes. They sit in small chambers called lacunae and extend long cytoplasmic processes through tiny channels called canaliculi, creating a communication network with neighboring osteocytes. This positioning and connectivity reflect their role in maintaining the bone matrix and coordinating remodeling in response to mechanical stress. Osteoblasts, by contrast, line the surfaces where new bone is formed, producing the matrix. Osteoclasts are larger, multinucleated cells that resorb bone on resorption surfaces. Chondrocytes reside in cartilage, not mineralized bone. So a cell nestled inside the bone matrix within a lacuna is characteristic of an osteocyte.

In bone tissue, the cells that are protected inside tiny spaces within the mineralized matrix are osteocytes. They sit in small chambers called lacunae and extend long cytoplasmic processes through tiny channels called canaliculi, creating a communication network with neighboring osteocytes. This positioning and connectivity reflect their role in maintaining the bone matrix and coordinating remodeling in response to mechanical stress.

Osteoblasts, by contrast, line the surfaces where new bone is formed, producing the matrix. Osteoclasts are larger, multinucleated cells that resorb bone on resorption surfaces. Chondrocytes reside in cartilage, not mineralized bone. So a cell nestled inside the bone matrix within a lacuna is characteristic of an osteocyte.