It is normal for many of the bones of the skull to remain unfused at birth. If they are fused at birth, we speak of a craniosynostosis. The term "fontanelle" is used to describe the resulting "soft spots". The relative positions of the bones continue to change during the life of the adult (though less rapidly), which can provide useful information in forensics and archaeology. In old age, cranial sutures may ossify (turn to bone) completely.
List of sutures
Most sutures are named for the bones they articulate, but some have special names of their own.