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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. 5 — Tilted horizontal sections of the anal canal dorsal wall in a 20-week fetus. HE staining. (A) The most superior side of the figure includes the inferior end of the coccyx (CO). Lower magnification than other panels while panels B, C and D are at the same magnification (B) 0.2 mm inferior to the panel A. (C) 0.2 mm inferior to the panel B. (D) The most inferior side of the figure and 0.2 mm inferior to the panel C. The levator ani muscle is located out side of the figure (much more superior and lateral). A connective tissue mass (asterisk) is present in the dorsal side of the CO. In the inferior side of the CO (panels C and D), another connective tissue mass (star) is seen connecting to the CO. Panels C and D include the back skin in the upper side of each panel. Fatty tissues (fat) start development in the ventral side of the gluteus maximus muscle (GM). In this specimen, there is no specific structure connecting between the external anal sphincter (EAS) and the inferior elongation of the coccyx (star).