Why do lumbar piercings at L3 to 4?

Lumbar puncture is generally performed between the 3rd and 4th lumbar vertebrae or the 4th and 5th lumbar vertebrae, where it is impossible to injure the spinal cord. The long cauda equina nerve roots swim in the cerebrospinal fluid and are not easy to puncture. It's a safe place for a waist piercing. The spinal cord is the part of the central nervous system. The spinal cord is lined with paired nerves (called spinal nerves) that run throughout the skin, muscles, and internal organs. The spinal cord is a pathway between peripheral nerves and the brain. It is also the lower center of many simple reflex activities. The spinal cord lies in the spinal canal and is cylindrical, slightly anteriorly and anteriorly, enclosing the capsule, which is consistent with the curvature of the spine. The upper end of the spinal cord is connected with the medulla oblongata at the foramen magnum, and the lower end is flush with the lower margin of the first lumbar vertebrae, about 40 ~ 45cm long. The ends of the spinal cord taper and are called spinal columns. From the column of the spinal cord descends into a slender filum terminalis, which is a fine plexus without nerve tissue, wrapped in a dura at the level of the second sacral vertebra, and terminating on the dorsal surface of the coccyx.

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