This includes the flat bones of the cranium, zygomatic, maxillae, mandible and part of the clavicles.

 Veiw Visual Step Chart to help memorize


1.  Mesenchyme cells differentiate into osteoblasts and start to secrete matrix

2.  Osteoblasts form spicules of matrix

3.  Spicules trap osteoblasts in lacuna

4.  Activity slows

5.  Trapped osteoblasts called osteocytes

6.  Bone growth proceeds outward from center (ossification center)

7.  spicules thicken into trabeculae (spongy bone)

8.  Trabeculae connect (compact bone)