The Ventricles and Cerebrospinal Fluid There are four cavities in the brain, called ventricles. The ventricles are filled with cerebrospinal fluid (CSF), which provides the following functions: • Absorbs physical shocks to the brain • Distributes nutritive materials to and removes wastes from nervous tissue • Provides a chemically stable environment There are four ventricles: • Each of two lateral ventricles (ventricles 1 and 2) occupies a cerebral hemisphere. • The third ventricle is connected by a passage (interventricular foramen) to each of the two lateral ventricles. • The fourth ventricle connects to the third ventricle (via the cerebral aqueduct) and to the central canal of the spinal cord (a narrow, central tube extending the length of the spinal cord). Additional openings in the fourth ventricle allow CSF to flow into the subarachnoid space. A network of capillaries called the choroid plexus projects into each ventricle. Ependymal cells (a
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