What's Protecting Your Brain?

TL;DR

Three protective layers called meninges — dura mater, arachnoid mater, and pia mater — plus cerebrospinal fluid act as a hydraulic cushion for the brain.

Key Points

• 1.The skull is not the brain's first line of protection. Beneath the skull lie the meninges, connective tissue membranes that wrap the brain before you ever reach it.
• 2.Two distinct meningeal layers serve different roles. The dura mater is a tough, thick outer covering, while the arachnoid mater is thinner and transparent, with spider-web-like extensions giving it its name.
• 3.Cerebrospinal fluid (CSF) acts as a hydraulic cushion between the brain and skull. It fills the space beneath the arachnoid mater, preventing the brain from slamming against the skull during sudden movements like headbanging.