A sequence of transverse MRI images of the lumbosacral spine (same subject) from (A) midsection of sacrum, (B) lumbosacral (L5–S1) intervertebral space,

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A sequence of transverse MRI images of the lumbosacral spine (same subject) from (A) midsection of sacrum, (B) lumbosacral (L5–S1) intervertebral space, (C) L5 spinous process, (D) L4 to L5 intervertebral space, (E) L4 spinous process, and (F) L3 to L4 intervertebral space. ESM, erector spinae muscle; MSC, median sacral crest; SIJ, sacroiliac joint; AP, articular process; SP, spinous process; FJ, facet joint; LF, ligamentum flavum; TP, transverse process. Source: Ultrasound Imaging of Sacrum and Lumbosacral Junction for Central Neuraxial Blocks, Atlas of Sonoanatomy for Regional Anesthesia and Pain Medicine Citation: Karmakar MK, Soh E, Chee V, Sheah K. Atlas of Sonoanatomy for Regional Anesthesia and Pain Medicine; 2018 Available at: https://accessanesthesiology.mhmedical.com/DownloadImage.aspx?image=/data/books/2220/karmakar_fig-09-32.png&sec=171517255&BookID=2220&ChapterSecID=171517193&imagename= Accessed: October 10, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved