Term Name:	pia mater
Synonyms:	pia, pia mater of neuraxis, pial membrane
Definition:	The innermost layer of the leptomeninges, consisting of a delicate membrane closely covering the surface of the brain and spinal cord,and lying under the arachnoid membrane. The pia, unlike the arachnoid, extends into the sulci in gyrencephalic animals.
Ontology:	Uberon Ontology [UBERON:0002361]