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Schematic anatomy of deep dissection of gluteal region. Most of gluteus maximus and medius muscles have been removed. Segment of sacrotuberous ligament also has been removed, revealing pudendal nerve. Pudendal nerve emerges from pelvis inferior relative to piriformis muscle and enters gluteal region medial relative to sciatic nerve, superficial relative to sacrospinous ligament, and deep relative to sacrotuberous ligament. After coursing around sacrospinous ligament, pudendal nerve reenters pelvis.10 Source: Pudendal Nerve Block, Atlas of Pain Medicine Procedures Citation: Diwan S, Staats PS. Atlas of Pain Medicine Procedures; 2015 Available at: http://mhmedical.com/ Accessed: May 15, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved