Merck Manual

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Brain Herniation: The Brain Under Pressure
PHY_herniation
Brain Herniation: The Brain Under Pressure

Bleeding or swelling in the brain can increase pressure within the skull. The pressure may force the brain sideways and downward in the skull through small openings in the relatively rigid sheets of tissue that separate the brain into compartments. The result is brain herniation. These dividers are extensions of the outer layer of tissue covering the brain (the dura mater.) Herniation compresses brain tissue and thus damages it.