Three-dimensional reconstruction of high-resolution computed tomography scan data set from a lumbar training phantom (CIRS Model 034, CIRS Inc., Norfolk, VA, USA). (A) Median sagittal scan of the spinous process (SP), (B) transverse interspinous view of the articular process (AP), transverse process (TP), and facet joint (FJ), (C) paramedian oblique sagittal scan showing the lamina and interlaminar space (ILS), and (D) paramedian sagittal scan at the level of the articular processes. ISS, interspinous space. Source: Chapter 44. Spinal Sonography and Considerations for Ultrasound-Guided Central Neuraxial Blockade, Hadzic's Peripheral Nerve Blocks and Anatomy for Ultrasound-Guided Regional Anesthesia, 2e Citation: Hadzic A. Hadzic's Peripheral Nerve Blocks and Anatomy for Ultrasound-Guided Regional Anesthesia, 2e; 2012 Available at: http://accessanesthesiology.mhmedical.com/DownloadImage.aspx?image=/data/books/hadzpnb2/hadzpnb2_c044f005.png&sec=41537110&BookID=518&ChapterSecID=41534335&imagename= Accessed: October 14, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved