Arachnoid Mater in a Cut Section of the Skull, Gross Anatomy

Description

Centered on a cut section of the adult male skull, the cranial vault is opened to expose the cerebral hemispheres and the meningeal coverings, with the arachnoid mater positioned deep to the dura mater and superficial to the pia mater. The dura lines the inner table of the calvaria and reflects toward the midline, while the arachnoid bridges across the sulci, maintaining the contour of the gyri rather than dipping into cortical grooves. Fine vascular markings on the cortical surface sit in the subarachnoid space, and the pia closely invests the brain surface, tracking into the sulci inferior to the arachnoid. Emphasis on the arachnoid’s relationship to the dura and to the subarachnoid space matters because this is where pathology collects and where procedures are targeted. Subarachnoid hemorrhage tracks along the sulci and basal cisterns within the subarachnoid space, while subdural hematoma accumulates between dura and arachnoid after tearing of bridging veins that traverse from cortical veins toward the dural venous sinuses. The sectioned skull context also supports surgical teaching: during craniotomy the surgeon opens scalp and calvaria, then the dura, and only then encounters the arachnoid and CSF space that must be protected during cortical exposure. Clear planes. Clear consequences. Use this artwork for neuroanatomy and gross anatomy teaching when introducing the meninges, CSF pathways, and the clinical distinction between epidural, subdural, and subarachnoid bleeding, or for neurosurgery and neuroradiology texts that need an orientation figure tied to real operative anatomy. It also fits patient education materials explaining why lumbar puncture samples CSF from the subarachnoid space and why meningeal irritation produces headache and nuchal rigidity. Anatomical accuracy verified by SciePro's Medical Advisory Board.