A procedure that inserts a needle into the spinal canal in the lower back to collect cerebrospinal fluid for testing or to inject medications. It's used to diagnose neurological conditions like meningitis or multiple sclerosis.
From Latin 'lumbus' meaning 'loin' or 'lower back' and 'punctura' meaning 'a pricking or piercing.' The procedure specifically targets the lumbar region of the spine where it's safest to access spinal fluid.
Lumbar puncture is performed below the level where the spinal cord ends (around L1-L2), so the needle only encounters floating nerve roots that move safely aside - like parting curtains rather than piercing a solid structure. The cerebrospinal fluid pressure can be measured during the procedure, providing important diagnostic information.
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