Pia mater
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Pia mater, often referred to as simply the pia, is the delicate innermost layer of the meninges, the membranes surrounding the brain and spinal cord. Pia mater is medieval Latin meaning "tender mother
Brain with arachnoid mater, and an area where it is removed, showing cerebral gyri covered by the translucent pia mater.
Ultrastructural diagram of the cerebral cortex (Viorel Pais, 2012)
Meninges
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In anatomy, the meninges are protective membranes that cover the brain and spinal cord. In mammals, three meninges have been clearly identified: the dura mater, the arachnoid mater, and the pia mater.
Image depicting meninges around the brain
Diagram of brain layers
Diagram of section of top of brain showing the meninges and subarachnoid space
Illustration by Antonio Pacchioni, Acta Eruditorum, 1703