What is the reason for the low external puncture and high internal puncture of the composite membrane?

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, which contains loose connective tissue, adipose tissue, lymphatic vessels, internal vertebral venous plexus, and spinal nerve roots. pass through. It does not communicate with the lower brain, and it has a slight negative pressure. Clinically, a lumbar puncture needle can be used to inject anesthetic into this gap to anesthetize the spinal nerve root.

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