Sciatic nerve at the level of popliteal fossa. Hematoxylin-eosin Sciatic nerve at the level of popliteal fossa. Hematoxylin-eosin. (Reproduced with permission from Reina MA, De Andres JA, Hernández JM, et al: Successive changes in extraneural structures from the subarachnoid nerve roots to the peripheral nerve, influencing anesthetic block, and treatment of acute postoperative pain. Eur J Pain. Suppl 2011;5(2):377-385.) Source: Connective Tissues of Peripheral Nerves, Hadzic's Textbook of Regional Anesthesia and Acute Pain Management, 2e Citation: Hadzic A. Hadzic's Textbook of Regional Anesthesia and Acute Pain Management, 2e; 2017 Available at: https://accessanesthesiology.mhmedical.com/DownloadImage.aspx?image=/data/books/2070/hadzic2_ch5_f003.png&sec=157598819&BookID=2070&ChapterSecID=157598812&imagename= Accessed: November 15, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved