There are four kinds of flat bones that include the skull (occipital-parietal nasal, and vomer) and the thoracic (sternum) and ribs, as well as the pelvis (ilium (ischium) and pubis). The function of flat bones is to safeguard internal organs such as the heart, brain and pelvic organs. Flat bones, https://beaudraio.fare-blog.com/8491600/what-are-the-effects-of-arthritis-on-bones