dural sac

dural sac
1. the portion of the spinal dura mater extending caudally from the level of the first or second lumbar vertebra to the attachment at the filum terminale externum, about the first or second sacral vertebra, and containing the lumbar cistern, cauda equina, cerebrospinal fluid, and filum terminale internum. 2. more broadly, the entire length of the spinal dura mater from the foramen magnum to the attachment at the filum terminale externum; located in the vertebral canal and containing the spinal cord, spinal roots, and the contents of the lumbar cistern.

Medical dictionary. 2011.

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