Common site for lumbar needle puncture? What structures does the needle pass through to reach the spinal canal? What position should the patient take? Why?

Most of the sites selected for lumbar puncture are the lumbar 3-4, lumbar 4-5 space, and the layers passed through are the skin, subcutaneous, supraspinous ligament, interspinous ligament, ligamentum flavum, and reach the spinal cord cavity. The patient is generally in the lateral position, with the back and the side of the bed perpendicular to the side of the bed, which is convenient for puncture.

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