The human body has four types of movable joints. Most people don’t really think about them unless they start to become painful. In fact, their motion is really quite beautiful, but that beauty can be hard to appreciate because we usually can’t see how the bones are sliding around relative to one another.
http://www.iflscience.com/health-and-medicine/amazing-x-ray-gifs-show-joints-motion
No hay comentarios.:
Publicar un comentario