Close-up views of the tips of a "cutting-tip" spinal needle: A Close-up views of the tips of a "cutting-tip" spinal needle: A. Quincke, and 2 "pencil-point" needles: B. Whitacre, C. Gertie-Marx. Also shown is the tip of a common epidural needle: D. 17-gauge Tuohy. Source: Section D. Regional Anesthesia, Anesthesiology, 2e Citation: Longnecker DE, Brown DL, Newman MF, Zapol WM. Anesthesiology, 2e; 2012 Available at: http://accessanesthesiology.mhmedical.com/DownloadImage.aspx?image=/data/books/long2/long2_c047f005.png&sec=40124631&BookID=490&ChapterSecID=40114733&imagename= Accessed: January 02, 2018 Copyright © 2018 McGraw-Hill Education. All rights reserved