Answer:
f: Cartilage model develops
b: Cartilage calcifies and a bone collar forms
a: Ossification center forms in the diaphysis
c: Ossification centers form in the epiphyses
e: Epiphyseal plates ossify
d: Bone replaces cartilage
Explanation:
Endochondral ossification follows these steps.
(a) Mesenchymal cells differentiate into chondrocytes which develops a cartilage model of the future bony skeleton.
(b) Blood vessels on the edge of the cartilage model bring osteoblasts that forms a bony collar.
(c) Capillaries penetrate cartilage and deposit bone inside cartilage model, forming primary ossification center. Ossification center that forms in the diaphysis, the center of the bone, and is the source of bone development
(d) Cartilage and chondrocytes continue to grow at ends of the bone while medullary cavity expands and remodels. Ossification centers form in the epiphyses or the end points of the bones
(e) Secondary ossification centers develop after birth. Epiphyseal plates ossify
(f) Bone replaces cartilage
