Where are the commonly selected sites for clinical lumbar puncture? What structures do the needles pass through in order from shallow to deep?

1. Commonly selected sites for clinical lumbar puncture:

The puncture point of lumbar puncture is generally in the line connecting the two posterior and superior iliac poles, and the needle is inserted in the gap between L3 and L4 or between L4 and L5.

2. The structure that the needle passes through in order from shallow to deep:

The puncture needle should pass through the skin, subcutaneous tissue, supraspinous ligament, interspinous ligament between spinous processes, ligamentum flavum, epidural space (including the internal vertebral venous plexus, dura mater, and arachnoid), and enter the subarachnoid space. , and is located between the roots of the cauda equina.

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