So the skull, the cranium, is an example of flat bones. So we have many of these flat bones that essentially fuse together as the organism becomes an adult, as the organism grows. And the skull. These flat bones basically serve the purpose of protecting our brain, our internal organ. Now, other examples of flat bones is the ribcage, as well as our sternum. And this acts not only as attachment points for muscles, but they also basically act to protect the heart, the lungs, as well as the vascular tissue found in this region here.