pia ma·ter /ˈpaɪəˌmetɚ/
pia ma·ter /-ˈmetɚ/ 名詞 軟腦(脊)膜
Pi·a ma·ter Anat. The delicate and highly vascular membrane immediately investing the brain and spinal cord. ◄ ►
pia mater n : the highly vascular innermost of the 3 meninges