#pia_mater__piamater  the highly vascular innermost of the 3 meninges
  supertype:  meninx__meninges  a membrane (one of 3) that envelops the brain and spinal cord
  part of:  leptomeninges__leptomeninge  the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers

No statement uses or specializes pia_mater; click here to add one.