A snap just before entering epidural space, during epidural anaesthesia, is due to piercing of which ligament?

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A snap just before entering epidural space, during epidural anaesthesia, is due to piercing of which ligament?

[A]. Supraspinatous ligament

[B]. Posterior longitudinal ligament

[C]. Ligamentum flavum

[D]. Interspinous ligament



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[C]. Ligamentum flavum
Explanation :-

  • In Lumber puncture, the tissues pierced are (in order): skin, subcutaneous tissue, supraspinal ligament, interspinal ligament, ligamentum flavum, dura mater, the arachnoid mater and into the subarachnoid space.
  • A spinal needle is inserted between the lumbar vertebrae L3/L4, L4/L5 or L5/S1.
  • It is pushed in until there is a “give” that indicates the needle is past the ligamentum flavum.
  • The needle is again pushed until there is a second “give” that indicates the needle is now past the dura mater.

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