Where does epidural puncture needle anesthetic often undertake why

Epidural puncture can be performed in the space of neck, chest, waist and sacral segments. Local anesthetics are injected into the epidural space to block the conduction function of some spinal nerves. When the tip of the descending needle passes through the ligamentum flavum, it can not Pierce the dura mater.

Anatomy: skin, subcutaneous tissue, supraspinous ligament, interspinous ligament, ligamentum flavum.

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