LP and ligaments

[Miracoli]

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When inserting a spinal tap needle in the lumbar region, in the midline, you hear and feel a 'pop' at the needle tip. What structure was perforated to cause the 'pop?'
A. intervertebral disk

B. anterior longitudinal ligament

C. ligamentum flavum

D. dura mater

E. arachnoid mater

 

[swoopyswoop]

dura

 

[Miracoli]

How many pops do you hear in an LP?

 

[surgok]

2, once through ligamentum flavum and once through dura

 

[Miracoli]

2, once through ligamentum flavum and once through dura

yes. So out of the 2 what should be the answer here?

 

[surgok]

ligamentum flavum 🙂

 

[Miracoli]

In "midline" LP?