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A suture is a type of fibrous joint (or synarthrosis) which only occurs in the skull (or "cranium"). It is normal for many of the bones of the skull to remain unfused at birth. 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.
A tiny amount of movement is permitted at sutures, which contributes to the compliance and elasticity of the skull. The joint between the mandible and the cranium, known as the temporomandibular joint, forms the only non-sutured joint in the skull. Most sutures are named for the bones that they articulate, but some have special names of their own .
Source: Boundless. “Unique Features of the Skull: Sutures.” Boundless Anatomy and Physiology. Boundless, 26 May. 2016. Retrieved 24 Jul. 2016 from https://www.boundless.com/physiology/textbooks/boundless-anatomy-and-physiology-textbook/skeletal-system-parts-of-the-skeleton-7/the-skull-79/unique-features-of-the-skull-sutures-463-1290/