Sacco Durale: What is it? Anatomy and Function. Pathologies and Clinical Use

The dural sac begins just before the foramen magnum, where the spinal cord also begins, and ends at the level of the second sacral vertebra.
In addition to enclosing the spinal cord, the dural sac also envelops the cauda equina; this occurs at the end of the spinal cord, from the second lumbar vertebra to the second sacral vertebra.
Together with the other two underlying meninges (arachnoid and pia mater), the dural sac has the task of protecting the spinal cord.
The dural sac is involved in various medical conditions (including tethered medulla oblongata syndrome) and diagnostic / therapeutic procedures (lumbar puncture and epidural anesthesia).