Identify the structure at the arrow?

Identify the structure at the arrow?

• A. Territorial Zone
• B. Interstitial Zone
• C. Chondrogenic Zone
• D. Interterritorial Zone

Answer: (A)

The region surrounding a chondrocyte lacuna is the territorial matrix. This pericellular layer is rich in sulfated proteoglycans, so it stains more intensely (basophilic) and often looks like a dark ring around each lacuna. That darker, pericellular zone around the cell is what you’d identify as the territorial matrix. In contrast, the interterritorial matrix sits between lacunae and typically has relatively less proteoglycan content and more collagen, so it stains lighter. The chondrogenic zone refers to areas involved in cartilage formation and differentiation, which isn’t the pericellular ring around a lacuna.

The region surrounding a chondrocyte lacuna is the territorial matrix. This pericellular layer is rich in sulfated proteoglycans, so it stains more intensely (basophilic) and often looks like a dark ring around each lacuna. That darker, pericellular zone around the cell is what you’d identify as the territorial matrix.

In contrast, the interterritorial matrix sits between lacunae and typically has relatively less proteoglycan content and more collagen, so it stains lighter. The chondrogenic zone refers to areas involved in cartilage formation and differentiation, which isn’t the pericellular ring around a lacuna.