Isogenous groups are clusters of chondrocytes that arise from cell division in which zone?

Isogenous groups are clusters of chondrocytes that arise from cell division in which zone?

• A. Chondrogenic zone
• B. Proliferative zone
• C. Maturation zone
• D. Calcification zone

Answer: (B)

Isogenous groups form from recent cell division of chondrocytes, which happens in the proliferative zone of the growth plate. In this zone, chondrocytes actively divide and align into columns; their daughter cells stay close together, creating clusters known as isogenous groups. This clustering reflects clonal expansion and is a key part of the process that builds the cartilaginous template for lengthening bones. In other zones, division is not the main activity: the resting (or chondrogenic) zone has cells that are not actively dividing, the maturation zone involves chondrocyte hypertrophy (enlargement) rather than division, and the calcification zone is where the cartilage matrix calcifies and is typically invaded by bone-forming cells. Hence, the proliferative zone is the source of isogenous groups.

Isogenous groups form from recent cell division of chondrocytes, which happens in the proliferative zone of the growth plate. In this zone, chondrocytes actively divide and align into columns; their daughter cells stay close together, creating clusters known as isogenous groups. This clustering reflects clonal expansion and is a key part of the process that builds the cartilaginous template for lengthening bones.

In other zones, division is not the main activity: the resting (or chondrogenic) zone has cells that are not actively dividing, the maturation zone involves chondrocyte hypertrophy (enlargement) rather than division, and the calcification zone is where the cartilage matrix calcifies and is typically invaded by bone-forming cells. Hence, the proliferative zone is the source of isogenous groups.