The pia mater is a thin, delicate membrane that closely invests the surface of the brain (Fig. 8.35). It follows the contours of the brain, entering the grooves and fissures on its surface, and is closely applied to the roots of the cranial nerves at their origins.
Arrangement of meninges and spaces
There is a unique arrangement of meninges coupled with real and potential spaces within the cranial cavity (Fig. 8.35).