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Reasons are small size of the constituting structures and poor visibility with most imaging methods. We reinvestigated the area in serial sections of three males (21\u201338\u00a0years old) of the American and Chinese Visible Human Projects and two 26\u2010week\u2010old male fetuses, and compared the findings with earlier observations in females. The mass of the levator ani muscle was approximately\u00a0twofold smaller and its funnel shape steeper in males than females. In the levator hiatus, a strand of the smooth longitudinal muscle layer of the rectum, the \u2018rectourethral (<jats:styled-content style=\"fixed-case\">RU<\/jats:styled-content>) muscle\u2019, extended anteriorly from the anorectal bend to the penile bulb. Fibrous tissue that formed in the inferior reach of the fetal <jats:styled-content style=\"fixed-case\">RU<\/jats:styled-content> muscle identified the location of the developing perineal body (<jats:styled-content style=\"fixed-case\">PB<\/jats:styled-content>) and divided the muscle into posterior \u2018rectoperineal\u2019 and anterior \u2018deep perineal\u2019 portions. In males, the <jats:styled-content style=\"fixed-case\">PB<\/jats:styled-content> remained small and bipartite, so that the <jats:styled-content style=\"fixed-case\">RU<\/jats:styled-content> muscle presented as an undivided midline structure. The well\u2010developed female <jats:styled-content style=\"fixed-case\">PB<\/jats:styled-content>, instead, intertwined with the deep perineal muscle and both structures passed the vagina bilaterally to form the perineal membrane in the posterior portion of the urogenital triangle. The urethral rhabdosphincter extended in the anterior portion of the urogenital triangle between the penile bulb inferiorly and the bladder neck superiorly, and consisted of a well\u2010developed circular \u2018membranous\u2019 portion with bilateral posteroinferior \u2018wings\u2019 and a thinner \u2018prostatic\u2019 portion on the prostate anterior side. In men, muscles occupy the urogenital triangle, but additional tightening of the locally fibrous adipose tissue by the superficial transverse perineal muscle appears necessary to generate functional support in women. An interactive 3D pdf file with these anatomical details (available online) should allow more accurate interpretation of ultrasound, computed tomography and magnetic resonance images.<\/jats:p>","DOI":"10.1111\/joa.12864","type":"journal-article","created":{"date-parts":[[2018,7,27]],"date-time":"2018-07-27T02:57:06Z","timestamp":1532660226000},"page":"447-459","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Architecture of structures in the urogenital triangle of young adult males; comparison with females"],"prefix":"10.1111","volume":"233","author":[{"given":"Yi","family":"Wu","sequence":"first","affiliation":[{"name":"Tytgat Institute for Liver and Intestinal Research Academic Medical Center University of Amsterdam Amsterdam The Netherlands"},{"name":"Institute of Digital Medicine College of Biomedical Engineering Third Military Medical University Chongqing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noshir F.","family":"Dabhoiwala","sequence":"additional","affiliation":[{"name":"Tytgat Institute for Liver and Intestinal Research Academic Medical Center University of Amsterdam Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaco","family":"Hagoort","sequence":"additional","affiliation":[{"name":"Department of Anatomy &amp; Embryology Academic Medical Center University of Amsterdam Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jill P. 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