Definition of pia in English:



mass nounAnatomy
  • The delicate innermost membrane enveloping the brain and spinal cord.

    • ‘These veins are found in the maternal part of the placenta, the spinal cord pia mater, retina, sinuses of the dura mater, most cerebral veins, trabecular veins of the spleen, and veins of the nail bed.’
    • ‘The innermost layer is the pia mater, a delicate vascular layer adherent to the surface of the brain and spinal cord.’
    • ‘The pia mater has received little attention regarding its function in the deformation of the spinal cord under compression.’
    • ‘The lining consists of three layers - dura, arachnoid and pia.’
    • ‘Arachnoid and pia are also called leptomeninges (thin membranes).’


Late 19th century: short for pia mater.