lumbar puncture

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lumbar puncture:

see spinal puncturespinal puncture,
surgical penetration of the spinal canal by a hollow needle introduced between two of the lumbar vertebrae. The arrangement permits injection of antibiotics or anesthetics (see anesthesia) as well as dyes to facilitate X-ray studies.
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lumbar puncture

Med insertion of a hollow needle into the lower region of the spinal cord to withdraw cerebrospinal fluid, introduce drugs, etc.