1. Early ultrasonographic detection of low-volume intraneural injection
N. Moayeri, A.C. Krediet, J.C. Welleweerd, R.L.A.W. Bleys, G.J. Groen 
British Journal of Anaesthesia 
Volume 109, Issue 3, Pages (September 2012)
DOI: /bja/aes208
Copyright © 2012 The Author(s) Terms and Conditions

2. Fig 1
Cryomicrotome cross-sections showing the results of US-guided intraneural injection in the supraclavicular brachial plexus (a, dye inside; b, dye outside; arrow) and in the sciatic nerve (c, dye inside; d, dye outside; arrow). Bar=1 cm. Arrowheads show the configuration of both nervous structures. 228×182 mm (300×300 DPI).
British Journal of Anaesthesia  , DOI: ( /bja/aes208)
Copyright © 2012 The Author(s) Terms and Conditions

3. Fig 2
(a) US overview of the sciatic nerve, SN; (b) insertion of the needle and indentation of the nerve wall; (c) needle tip inside the nerve adjacent to the nerve fascicles; (d) increase in nerve surface area in combination with change in echogenicity after injection of 0.5 ml of injectate. Arrowheads show the surroundings of the sciatic nerve, arrows point to the needle track. *Immediate change in internal echogenicity. 295×248 mm (72×72 DPI).
British Journal of Anaesthesia  , DOI: ( /bja/aes208)
Copyright © 2012 The Author(s) Terms and Conditions