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. 2012 May 22;53(4):849–855. doi: 10.3349/ymj.2012.53.4.849

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© Copyright: Yonsei University College of Medicine 2012

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 2 — Transverse sections of the anal canal dorsal wall. (A) 86 years old female, 10 mm inferior side of the coccyx (CO), displays a small fibrous tissue mass (arrows) at a gap between the bilateral levator slings (LA). This gap was the smallest in specimens examined (3 mm). (B) 92 years old male, inferior end of the CO and the most superior part of the anococcygeal ligament (ACL). (C) Same specimen as panel B. Panel B corresponds to the, whereas panel C contains the inferior end of the ligament at a level 20 mm inferior side of the CO. In panel C, note a fibrous tissue mass (arrows) in the dorsal side of the external anal sphincter (EAS) and the ligament. (D) A higher magnification view of a square in panel B. (E) A higher magnification view of a square in panel C. Arrows in panels D and E show smooth muscles (panel D) or striated muscles (panel E) in the anococcygeal ligament, respectively. GM, gluteus maximus muscle.