There are both primary and secondary ossification centers that are involved in osteogenesis (formation of bone).
Primary ossification centers
- where bone first forms
- long bones (shaft or diaphysis)
- irregular bones (body)
Secondary ossification centers
- individual bones may have multiple centers
- usually found in epiphysis
Axial skeleton
- skull
- hyoid
- spine
- thorax
- ribs
- sternum
Appendicular skeleton
Upper limb
- pectoral girdle
- elbow
- wrist and hand