Why is the lumbar puncture needle lower than the head?

Spinal puncture is performed in the lumbar 4 space or the lumbar 4 and 5, and adults can go up to the lumbar 2 and lumbar 3 space. Because: 1. Below the level of the cauda equina nerve, the nerve will not be injured. 2. The spinous processes here are straight and the gap between the spinous processes is large, making it easy to insert needles.

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