<prompt> In epidural lumbar puncture, all of these structures are pierced EXCEPT:Posterior longitudinal ligamentLigamentous flavumInterspinous ligamentSupraspinous ligament  <response>: Ans. A Posterior longitudinal ligamentRef: Grays, 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. 