Pathology The ___________ is the innermost meningeal layer, clings tightly to the surface of the brain and spinal cord, following every fold. A Arachnoid mater B Pia mater C Dura mater D Tentorium cerebelli 💡 Explanation The ___________ is the innermost meningeal layer, clings tightly to the surface of the brain and spinal cord, following every fold. ✓ Correct Answer: B. Pia mater