how nervous tissues are protected
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- The CNS is protected externally by a hard covering___cranium for brain and vertebral column for spinal cord.
- The CNS is covered with a tri-layer membrane___meninges.
- The CNS contain one fluid known as cerebro spinal fluid which save the CNS from mechanical injury.
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The brain is protected by the bones of the skull and by a covering of three thin membranes called meninges. The brain is also cushioned and protected by cerebrospinal fluid. This watery fluid is produced by special cells in the four hollow spaces in the brain, called ventricles.
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