Does lumbar puncture needle often choose place? Through what structures does the needle reach the spinal canal? What position should the patient take? Why is that?

Lumbar puncture is generally selected for the third, fourth and fifth lumbar Spaces, through the layers of skin, subcutaneous, supraspinous ligament, interspinous ligament, ligamentum flavum, to the spinal cavity. The patient is usually in lateral decubitus position with the back perpendicular to the side of the bed for easy puncture.

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