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Questions and Answers
During a lumbar puncture, the needle is inserted between which spinal levels?
During a lumbar puncture, the needle is inserted between which spinal levels?
- L2 and L3
- L3 and L4 (correct)
- L4 and L5
- L1 and L2
Where does the conus medullaris typically lie in children between the ages of 1 and 7 years?
Where does the conus medullaris typically lie in children between the ages of 1 and 7 years?
- Between L3 and L4
- Between T12 and L3 (correct)
- Between L4 and L5
- Between L1 and L2
What is the significance of the 'pop' sensation during a lumbar puncture?
What is the significance of the 'pop' sensation during a lumbar puncture?
- Piercing the arachnoid mater
- Entering the epidural space
- Piercing the ligamentum flavum (correct)
- Piercing the dura mater
Where is Tuffier’s line drawn to serve as a landmark for lumbar puncture?
Where is Tuffier’s line drawn to serve as a landmark for lumbar puncture?
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Where is the terminal end of the spinal cord, the conus medullaris, typically located in the average adult?
Where is the terminal end of the spinal cord, the conus medullaris, typically located in the average adult?
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Study Notes
Lumbar Puncture
- The needle is inserted between L3-L4 or L4-L5 spinal levels during a lumbar puncture.
Conus Medullaris Location
- In children between 1-7 years old, the conus medullaris typically lies at the L3 vertebral level.
- In the average adult, the conus medullaris is typically located at the L1-L2 vertebral level.
Significance of the 'Pop' Sensation
- The 'pop' sensation during a lumbar puncture indicates that the needle has pierced the dura mater, entering the subarachnoid space.
Tuffier's Line Landmark
- Tuffier's line is drawn through the superior iliac crests to serve as a landmark for lumbar puncture, indicating the level of L4.
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