During epidural anesthesia, what structures need to pass through the puncture needle to enter the epidural space

Straight puncture:

Skin, subcutaneous connective tissue, supraspinous ligament, interspinous ligament, ligamentum flavum, epidural space

Lateral puncture:

Skin, subcutaneous connective tissue, part of the interspinous ligament, ligamentum flavum, epidural space

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