Dura Mater, Lateral View

Description

Seen in lateral profile, the cranial dura mater lines the inner table of the calvaria and reflects inward to form the falx cerebri in the midline and the tentorium cerebelli as a transverse dural shelf separating supratentorial cerebrum from infratentorial cerebellum. Superficial meningeal layers can be inferred, with arachnoid mater apposed to dura and pia mater investing the cortical surface, while the upper cervical dura continues inferiorly around the brainstem and into the vertebral canal. Along the cranial base, dural sleeves extend toward exiting cranial nerves, and the dural reflections frame venous channels that course between dural layers, consistent with the accompanying arterial (red) and venous (blue) network. A lateral dural view matters because the falx and tentorium are not just partitions, they define surgical corridors and constrain mass effect. Subfalcine herniation drives the cingulate gyrus beneath the falx and can compress the anterior cerebral artery, while transtentorial (uncal) herniation displaces medial temporal lobe across the tentorial notch, placing the oculomotor nerve and posterior cerebral artery at risk and distorting the brainstem. Small shifts. Big consequences. This perspective also supports teaching of dural venous sinus anatomy at the tentorial attachments, a common site for dural arteriovenous fistulas and meningioma origin. Use this illustration in neuroanatomy and neuroradiology courses to orient dural reflections against cortical lobes, brainstem, and upper spinal cord, and in neurosurgical publishing when describing approaches around the tentorial edge or discussing patterns of intracranial herniation and venous sinus involvement. It also fits patient education materials on meninges, epidural versus subdural bleeding, and why dural folds compartmentalize pathology on CT and MRI. Anatomical accuracy verified by SciePro's Medical Advisory Board.