A synarthrosis is a type of joint which allows no movement under normal conditions.

Syndesmoses are considered to be amphiarthrotic, because they allow a small amount of movement.

[1] They can be categorised by how the bones are joined together: The articulating surfaces of synarthroses have little or no mobility, and are strongly united to each other.

For example, most of the joints of the skull are held together by fibrous connective tissue and do not allow for movement between the adjacent bones.

This lack of mobility is important, because the skull bones serve to protect the brain.