Cerebrospinal fluid
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Cerebrospinal fluid is a clear, colorless transcellular body fluid found within the meningeal tissue that surrounds the vertebrate brain and spinal cord, and in the ventricles of the brain.
The cerebrospinal fluid circulates in the subarachnoid space around the brain and spinal cord, and in the ventricles of the brain.
Vials containing human cerebrospinal fluid
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)