Premature fusion of one of the coronal sutures may cause the skull to flatten on the affected side. The premature closure of the sutures may occur unilaterally or bilaterally. This term arises from the ancient Greek word “plagios,” meaning oblique or slanting. When the lambdoidal suture closes prematurely, the condition is called posterior plagiocephaly. When the coronal suture closes prematurely, the condition is known as anterior plagiocephaly. Ĭraniosynostosis is a condition where the sutures prematurely close. The pterion is deemed the skull's weakest part. Several minor sutures such as the sphenoparietal suture, sphenosquamous suture, sphenofrontal suture are at the pterion. The pterion is the area where four bones, the parietal, frontal bones, the greater wing of the sphenoid bone, and the squamous part of the temporal approach each other. The coronal suture extends caudal (toward the base of the skull) to the pterion. This point is called the "bregma" and indicates the position of the anterior fontanel. The coronal suture extends cephalad (toward the apex of the skull) and meets the sagittal suture. It is one of the four major sutures of the skull alongside the metopic (also known as a frontal suture), sagittal, and lambdoid sutures. The term is derived from the Latin word "corona" and from the Ancient Greek word "korone," both translating to “garland” or “crown,” referring to the anatomical location where a crown would be placed. The coronal suture is oblique in direction and extends between the frontal and the parietal bones. A syndesmosis is a fibrous joint between two bones. Cranial sutures are syndesmosis between the cranial bones.
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