Sources

- http://www.innerbody.com/image/skelfov.html#full-description

- https://prezi.com/m/on5ivcitoopu/the-skeletal-system-explained/

- http://www.livescience.com/44137-skeletal-system-surprising-facts.html

- http://www.sciencekids.co.nz/sciencefacts/humanbody/skeletonbones.html