Where is lumbar puncture needle often carried out? What structures are used to reach the spinal canal?

The puncture point is generally connected to the two posterior superior iliac poles, and the needle is inserted in the gap between L3 and L4 or L4 and L5. The puncture needle should enter the subarachnoid space through the skin, subcutaneous tissue, supraspinous ligament, interspinous ligament between the spinous process, ligamentum flavum, and epidural space successively, and be located between the cauda equina nerve roots

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