Arachnoid mater
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The arachnoid mater is one of the three meninges, the protective membranes that cover the brain and spinal cord. It is so named because of its resemblance to a spider web. The arachnoid mater is a der
Image showing arachnoid mater and the underlying subarachnoid space
Image showing parts of the arachnoid mater, including arachnoid granulations.
Brain with arachnoid mater, and an area where it is removed, showing cerebral gyri covered by the translucent pia mater.
Spinal dura mater opened, arachnoid mater visible.
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
Ultrastructural diagram of the cerebral cortex (Viorel Pais, 2012)