<Tr> <Th> FMA </Th> <Td> 7492 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> Fibrous joints are connected by dense connective tissue, consisting mainly of collagen . These are fixed joints where bones are united by a layer of white fibrous tissue of varying thickness . In the skull the joints between the bones are called sutures . Such immovable joints are also referred to as synarthroses . </P> <P> Most fibrous joints are also called "fixed" or "immovable", because they do not move . These joints have no joint cavity and are connected via fibrous connective tissue . </P>

The sutures in the skull are what kind of joints