L4 or L3 interspinous space

What does "L4 or L3 interspinous space" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.

Explanation

The "L4 or L3 interspinous space" refers to the area between the spinous processes of the fourth and third lumbar vertebrae in the lower back. The spinous processes are the bony projections off the back of each vertebra, which you can feel when you run your hand down your spine. The space between these processes is often used as a landmark for certain medical procedures, such as spinal anesthesia or lumbar puncture.

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