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Epidural

Epidural

Epidural refers to something situated on or outside of the dura mater. The dura mater (L. "hard mother") is the outermost, toughest, and most fibrous of the three membranes (meninges) covering the brain and spinal cord.


References
Ingelfinger, F.J. 1980. Dorlands Medical Dictionary. Saunders Press Pub., Philadelphia. 740.