Sunday, February 4, 2024

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:


Intramembranous Ossification

Endochondral Ossification

Bone Type

Flat bones

Long bones

Precursor Tissue

Mesenchymal tissue



Direct conversion of mesenchymal cells to bone cells

Cartilage model replaced by bone tissue


Primarily for bone width & expansion

Primarily for bone length & growth