Flat bone grows by Endochondral ossification

Flat bone grows by Endochondral ossification?

• A. True.
• B. False.

The statement "Flat bone grows by Endochondral ossification" is False.

Flat bones, such as those in the skull, mandible, and clavicle, grow through a process called intramembranous ossification. This process involves the direct conversion of mesenchymal cells (fibroblasts) into bone cells within a membrane, without involving a cartilage intermediate.

In contrast, Endochondral ossification is the process by which long bones grow. It involves the formation of a cartilage model that is gradually replaced by bone tissue. This process is responsible for the lengthening of long bones like the femur, tibia, and humerus.

Here's a table summarizing the key differences:

Feature	Intramembranous Ossification	Endochondral Ossification
Bone Type	Flat bones	Long bones
Precursor Tissue	Mesenchymal tissue	Cartilage
Process	Direct conversion of mesenchymal cells to bone cells	Cartilage model replaced by bone tissue
Function	Primarily for bone width & expansion	Primarily for bone length & growth