URL：https://www.researchgate.net/publication/333270931/figure/fig4/AS:941412522659890@1601461644865/Drawing-describing-the-anal-canal-anatomy-The-anorectal-junction-refers-to-the-point-of.png
掲載元：https://www.researchgate.net/figure/Drawing-describing-the-anal-canal-anatomy-The-anorectal-junction-refers-to-the-point-of_fig4_333270931
