6. What is the difference between the proximal and distal epiphyses? 7. List the two layers of the periosteum. 8. What are the functions of the outer layer of the periosteum? 9. Which bone cells are in the inner layer of the periosteum? 10. Where will the endosteum be located? 11. What cells are in the endosteum? 12. Understand the structure of short, irregular and flat bones. .