Lumbar Puncture vs. Epidural: Anatomic Differences and CSF Sampling
A lumbar puncture (spinal tap) accesses the subarachnoid space (between arachnoid and pia mater) in the lumbar spine (typically L3–L4 or L4–L5) to obtain cerebrospinal fluid (CSF) for diagnosis (meningitis, SAH, demyelination) or therapeutic injection.
The epidural space lies external to the dura mater, containing fat, veins, and connective tissue. Epidural needles/catheters are placed here for anesthesia/analgesia (labor, surgery, chronic pain).
Key distinction: LP needle penetrates dura/arachnoid; epidural needle stops before dura. Confusing the two risks failed CSF collection or unintended dural puncture (post‑dural puncture headache).
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