RALPH HUTCHINGS, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY RALPH HUTCHINGS, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY
A complete human brain within the meningeal membranes (or dura) from above. A large window has been cut in the meninges to expose the brain beneath. The brain and spinal cord are surrounded by three protective meningeal membranes. Near the center note the arachnoid granulations or small projections through which cerebrospinal fluid is absorbed from within the meninges and into the blood.
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