MEDICAL
NERVES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In which area of the spinal canal would a the needle for a lumbar puncture be inserted?
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Subarachnoid Space
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Epidural Space
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Interventricular Foramen
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Cerebral Aqueduct
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Explanation:
Detailed explanation-1: -The spinal needle can be safely inserted into the subarachnoid space at the L3-4 or L4-5 interspace, since this is well below the termination of the spinal cord in most patients.
Detailed explanation-2: -The needle then passes through epidural space (fat tissue and internal vertebral venous plexus) and then may palpably pop-again-through the dura mater (and simultaneously through the adjacent subarachnoid membrane) to enter the subarachnoid space (CSF space).
Detailed explanation-3: -This lumbar puncture is done with the patient in the lateral decubitus position and the lumbar puncture needle inserted at the L3-L4 interspace.
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