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While most joints are held together by tissues such as tendons, ligaments, or muscles, fixed joints are held together by a tough fibre that permits no movement they are therefore also known as Fibrous joints.

An example of a fixed joint is between the bones in the skull. When you are born, your skull bones are not joined together there is, in fact, a gap between the bones called the fontanel, the soft spot on the top of a baby's  head. This movement is necessary for safe birth the skull is compressed during birth, and must be flexible.

As you grow, however, the bones quickly grow together and harden in order to perform their primary function, protecting the brain.