False
The brain is protected by three membranous coverings called meninges. The three coverings include:
(I) Dura mater: the outermost tough fibrous membrane.
(ii) Arachnoid: the thin delicate middle layer forming a web-like cushion.
(iii) Pia mater: the innermost highly vascular membrane, richly supplied with blood.
Hence, arachnoid is the middle layer of meninges while pia mater is the innermost layer.