The skeleton layout is all on protecting the parts of your body and keeping them in the right place. The diagram below shows the main bones in your body. The femur is the longest bone. The purple bones are the less important bones so you won't have a life changing incident if one of these get broken. The green bones are strong but you only have them once they are hard to replace and broken bones like your spinal cord or your skull will hurt and may change your life depending on were your bone was broken.