Epidural anesthesia is introduced in the epidural space between the to block pain signals during child birth.

Between the dural sheath and vertebral bones.

Dural sheath or dura mater is the outermost of the three membranes, the  meninges, that protect the central nervous system (brain and spinal cord).
Epidural anesthesia is introduced in the epidural space which is the space inside the bony spinal canal but just outside the dura mater.

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