When making epidural anesthesia needle, what is the puncture site, mark and puncture hierarchy?

Epidural puncture can be performed in all spinal Spaces, but at present, the most common one is lumbar space puncture, which can meet the needs of the operation below the abdomen. High epidural is rarely used, which is difficult to puncture and has high risk. The positioning method is to connect the anterior superior iliac spine directly to the lumbar 3/4 space or lumbar 4 spinous process. The layers are skin, subcutaneous tissue, supraspinous ligament, interspinous ligament and ligamentum flavum

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