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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 .
based on the absence of the sagittal suture, the individual was in his/her 60s, based on the presence of the anterior fontanelle, the individual was in his/her 20s, based on the presence of the metopic suture, the individual was in his/her 40s, or based on the absence of the temporomandibular suture, the individual was in his/her teens
Source: Boundless. “Unique Features of the Skull: Sutures.” Boundless Anatomy and Physiology. Boundless, 21 Jul. 2015. Retrieved 07 Oct. 2015 from https://www.boundless.com/physiology/textbooks/boundless-anatomy-and-physiology-textbook/the-skeletal-system-7/the-skull-79/unique-features-of-the-skull-sutures-463-1290/