Anatomical Considerations During Lumbar Puncture Lumbar puncture is usually performed with the patient in the lateral recumbent position. To avoid rotation.

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Anatomical Considerations During Lumbar Puncture Lumbar puncture is usually performed with the patient in the lateral recumbent position. To avoid rotation of the vertebral column, align the patient's shoulders and pelvis in a plane perpendicular to the bed. A line connecting the superior border of the posterior iliac crests intersects the L4 spinous process or the L4-L5 interspace. Insert the lumbar puncture needle in the midline of the L3-L4, L4-L5 (most commonly), or L5-S1 vertebral interspace. These interspaces are below the end of the spinal cord, which terminates at the level of L1. Angle the needle toward the patient's umbilicus and advance it slowly. The needle will penetrate the ligamentum flavum, dura, and arachnoid to enter the subarachnoid space, where cerebrospinal fluid is located. Source: Lumbar Puncture, The Rational Clinical Examination: Evidence-Based Clinical Diagnosis Citation: Simel DL, Rennie D. The Rational Clinical Examination: Evidence-Based Clinical Diagnosis; 2016 Available at: https://jamaevidence.mhmedical.com/DownloadImage.aspx?image=/data/books/845/sim_ch70_f001.png&sec=68734531&BookID=845&ChapterSecID=61357639&imagename= Accessed: November 14, 2017 Copyright © 2017 American Medical Association. All rights reserved

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