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Dural sacThe membranous sac that encases the spinal cord within the bony structure of the vertebral column. Dural refers to the dura, the name of the membrane around the spinal cord (and brain, too).
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Dural sacAs the dura mater extends beyond the lower end of the spinal cord, it is called the dural sac. It is also made up of the arachnoid mater.
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