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Skull Sutures

suturae cranii

The skull sutures are fibrous joints between the flat bones of the cranial vault, including the coronal suture (frontal with parietals), sagittal suture (between parietals), lambdoid suture (parietals with occipital), squamosal sutures (temporal with parietal), and metopic suture (between frontal bone halves, fusing by age 2). The sutures allow moulding of the fetal skull during birth and slight expansion during brain growth, fusing progressively from the third decade onward.

Region: Head & Skull

Clinical Relevance

Clinical Notes

Craniosynostosis is premature fusion of one or more cranial sutures during fetal or early infant development, producing characteristic skull deformities: scaphocephaly (sagittal), trigonocephaly (metopic), plagiocephaly (unilateral coronal or lambdoid). It may impair brain growth and produce intracranial hypertension requiring surgical suturectomy or cranial remodelling. Diastasis of the sutures on skull radiograph indicates raised intracranial pressure in children. Posterior fossa decompression for Chiari malformation involves the occiput and the lambdoid suture region.

Pathology

Common Injuries & Conditions

Craniosynostosis

Premature fusion of cranial sutures restricts skull growth perpendicular to the fused suture and causes compensatory expansion elsewhere, producing characteristic deformities managed by surgical cranial vault remodelling in the first year of life to provide adequate cranial volume for brain growth.

Suture Diastasis

Separation of cranial sutures from elevated intracranial pressure, seen on skull X-ray as widened suture lines, is a radiological sign of raised ICP in children before suture fusion, indicating chronic hydrocephalus or intracranial mass lesion requiring neurosurgical evaluation.