SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Water on the brain. Coloured 3-D computed tomography (CT) scans of brain ventricles and ducts in hydrocephalus (water on the brain). This is an accumulation of cerebrospinal fluid (CSF), the liquid that surrounds and cushions the brain and spinal cord. The large lateral ventricles in the brain drain into the third ventricle (lower right) through the foramen of Monroe (lower left). From here, the CSF passes through the Sylvian aqueduct (upper right) to the fourth ventricle (upper left). The ventricles are lined with tissues that produce CSF. The fluid naturally drains into the blood, but a narrowing or blockage of one of the ducts through which it flows can raise the internal pressure in the head.
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