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. Author manuscript; available in PMC: 2013 Oct 1.
Published in final edited form as: Acta Anaesthesiol Scand. 2012 Jul 30;56(9):1146–1151. doi: 10.1111/j.1399-6576.2012.02745.x

Figure 2.

Figure 2

Ultrasound image of interscalene block illustrating incomplete envelopment of nerve roots by local anesthetic solution in the interscalene groove. In this imaging plane, the solution is seen to collect only on the lateral side of the roots. (N = nerve root, NE = needle, LA = local anesthetic solution)