Epidural space was punctured from shallow to deep

Epidural space: the narrow space between the periosteum and ligamentum flavum of the inner surface of the dura and spinal canal is called epidural space, which has loose connective tissue, adipose tissue, lymphatic tube, vertebral vein plexus, and spinal nerve root through. Not connected with the lower intracranial, slightly negative pressure, clinical lumbar puncture can be injected into this gap to anesthetize the spinal nerve root.

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