Squamosal Border Of The Parietal Bone, Lateral View

Description

Parietal bone anatomy dominates the lateral cranium, with the margo squamosus (squamosal border) forming the thin, serrated inferior margin that overlaps the squama temporalis along the sutura squamosa. From this fixed side perspective, the border sits inferior to the parietal eminence and runs anteroinferiorly toward the pterion, where the parietal meets the frontal, sphenoid (greater wing), and temporal bones. Posteriorly, the squamosal border approaches the asterion region, transitioning toward the occipital articulation. Sutural teeth are the focus. Clinically, this edge frames common craniotomy corridors and fracture patterns because the lateral cranial wall thins near the pterion, where blunt trauma can lacerate the middle meningeal artery deep to the temporal fossa and lead to an epidural hematoma. A neurosurgeon planning a pterional approach needs a precise sense of where the squamosal suture lies relative to the temporal squama and the superior temporal line, which guides temporalis muscle elevation and burr hole placement. Crisp emphasis on the overlapping bevel and interdigitations helps differentiate true sutural separation from linear fractures on radiographs and CT bone windows. Orientation matters. Use this illustration in gross anatomy teaching for skull sutures and lateral cranial landmarks, in neurosurgical atlases discussing pterional and temporal craniotomy entry points, or in forensic and osteology references that distinguish normal sutural morphology from perimortem fracture. Anatomical accuracy verified by SciePro's Medical Advisory Board.