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Michael P. D'Alessandro, M.D.
Peer Review Status: Internally Peer Reviewed
The major sutures are the coronal, sagittal, lambdoid, squamosal, metopic and mendosal sutures. Sutures in the postnatal period appear wide because membranous ossification is incomplete at the sutural margins. Suture widening is seen in the preterm infant, hypophosphatasia, rickets, hypothyroidism, and skeletal dysplasias. The anterior fontanelle closes at 12-18 months of age while the posterior fontanelle closes either 2 months prenatally or 2 months postnatally. The coronal, lambdoid and sagittal sutures persist throughout childhood and generally do not begin to close until 30 years of age.
See References Chapter.
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