The concept of epidural space

Epidural space: The narrow space between the dura mater and the periosteum and ligamentum flavum on the inner surface of the spinal canal is called the epidural space. It contains loose connective tissue, adipose tissue, lymphatic vessels, intravertebral venous plexus, and spinal nerve roots. pass through. No intracranial communication, slightly negative pressure, clinically, lumbar puncture needles can be used for puncture to inject anesthetics into this space to anesthetize the spinal nerve roots.

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