This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy, Subject name: Anatomy
In epidural lumbar puncture, all of these structures are pierced EXCEPT: 
Select and explain. 
A. Posterior longitudinal ligament, B. Ligamentous flavum, C. Interspinous ligament, D. Supraspinous ligament
A: Posterior longitudinal ligament
Answer: A: Posterior longitudinal ligament 
Explanation: Ans. A Posterior longitudinal ligamentRef: Gray's, 38th ed. pg. 512; Keith Moore, 4th ed. pg. 483* Structures pierced during lumbar puncture (from outside in) are:- Skin - subcutaneous tissue - Supraspinous & interspinous ligament - Ligament flavum - Duramater - Arachnoid mater.