DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Brain membrane. Light micrograph of the pia mater, the inner layer of the meninges, the three membranes that surround the brain and spinal cord. The pia mater is a fibrous membrane that is impermeable to water. The network of blood vessels (seen here) that supply the brain pass through the pia mater. Magnification: x5 when printed at 10 centimetres wide.
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