1. Intramembraneous Ossification
Bones
Intramembraneous Ossification

2. Mesenchymal cells condense into an ossification center

3. Cancellous vs Compact Bone
Bones
Cancellous vs Compact Bone

4. Diagram of a long bone withcompact and cancellous bone

5. Long bone with compact (arrows) and cancellous bone

6. Cancellous Bone

7. LM of a cancellous bone spicule

8. Diagram of compact bone (Haversian Systems)

9. Compact Bone

10. Haversian system (osteon) with central canal and osteocytes in lacunae connected by canaliculi

11. Decalcified compact bone

12. Bones
The cells of bone

13. TEM of an osteocyte in lacuane (left) and high mag of calcifying matrix (right)

14. Multinucleated osteoclast

15. SEM of an osteoclast

16. Endochondrial Ossification - Long bone growth
Bones
Endochondrial Ossification - Long bone growth

17. Diagram of endochondrial ossification

18. Low mag of an epiphyseal growth plate (square) of a long bone

19. Long bone growth plate at epiphyseal end – note four zones