immediate transformation of leptomeninx pia-arachnoid neuronames:2347 arachnoidea mater et pia mater Wikipedia:Leptomeninges pia-arachnoid of neuraxis BTO:0001634 Pia mater or arachnoid mater. NLXANAT:090207 arachnoid mater and pia mater SCTID:362303006 UBERON:0000391 NCIT:C32979 FMA:231515 CALOHA:TS-0546 meninx endomeninx