appositional growth

Osteogenic cells that originate from the periosteum increase appositional growth and a bone collar is formed.

The osteoblasts secrete osteoid against the shaft of the cartilage model (Appositional Growth).

The process of appositional growth occurs when the cartilage model also grows in thickness due to the addition of more extracellular matrix on the peripheral cartilage surface, which is accompanied by new chondroblasts that develop from the perichondrium.