When Performing a Lumbar Puncture (Spinal Tap) on an Adult $60-150$

When performing a lumbar puncture (spinal tap) on an adult, the following anatomic facts have to be taken into consideration except which?

A) With the patient in the lateral prone or upright sitting position, the vertebral column should be well flexed to separate the spines and laminae of adjacent vertebrae.
B) An imaginary line joining the anterior superior iliac spines passes over the fourth lumbar spine.
C) The needle should be inserted above or below the fourth lumbar spine.
D) To enter the subarachnoid space, the needle will pass through the skin, superficial fascia, supraspinous ligament, interspinous ligament, ligamentum flavum, areolar tissue (containing the internal vertebral venous plexus) , dura mater, and arachnoid mater.
E) The spinal cord ends below in the adult at the level of the lower border of the first lumbar vertebra.
F) With the patient in the lateral prone position, the normal cerebrospinal fluid pressure is about $60-150$ $\mathrm{mm} \mathrm{H}_{2} \mathrm{O}$ .