{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T16:11:46Z","timestamp":1775664706236,"version":"3.50.1"},"reference-count":17,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2019,10,14]],"date-time":"2019-10-14T00:00:00Z","timestamp":1571011200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical Anatomy"],"published-print":{"date-parts":[[2020,7]]},"abstract":"<jats:p>The anatomical position of the vermiform appendix varies among adults, and these variations are responsible for differences in the symptoms of appendicitis. However, to date no study has examined how and when these variations occur during fetal development. The present study examined horizontal sections of 27 midterm fetuses (crown rump length [CRL] 38\u201397\u2009mm, gestational age approximately 8\u201315\u2009weeks). There were 10 fetuses (CRL 56\u2009mm or more) in which the cecum and appendix were in a posterosuperior site near the right kidney (postmigration phase), and 12 fetuses (CRL 39\u201372\u2009mm) in which the ileocecal junction and appendix remained on the visceral surface of the liver in the anterior or anterolateral abdominal cavity (migration phase, after physiological umbilical herniation). Analysis of the 12 fetuses in the migration phase indicated that the appendix extended inferiorly in eight fetuses and superiorly in four fetuses. Likewise, a \u201cpreileal\u201d appendix (a morphology in which the distal part of the appendix was in front of the terminal ileum) was present in eight of these fetuses. Extension of the appendix superiorly or inferiorly during the migration phase seems unrelated to the topographical relationship of the appendix with the terminal ileum at the postmigration phase in fetuses and in adults. Conversely, it seems likely that a retroileal appendix leads to a coiled appendix behind the ileocecal junction. \u201cGuidance\u201d by the liver surface seemed to be important for posterior migration, which ended with the ascent of the liver. Clin. Anat., 33:667\u2013677, 2020. \u00a9 2019 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/ca.23484","type":"journal-article","created":{"date-parts":[[2019,10,2]],"date-time":"2019-10-02T02:33:20Z","timestamp":1569983600000},"page":"667-677","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Vermiform Appendix During the Repackaging Process from Umbilical Herniation to Fixation onto the Right Posterior Abdomen"],"prefix":"10.1002","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9653-7261","authenticated-orcid":false,"given":"Ji H.","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Anatomy Jeonbuk University Medical School  Jeonju Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6789-2977","authenticated-orcid":false,"given":"Zhe W.","family":"Jin","sequence":"additional","affiliation":[{"name":"Department of Anatomy, Wuxi School of Medicine Jiangnan University  Wuxi Jiangsu China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3412-7002","authenticated-orcid":false,"given":"Shunichi","family":"Shibata","sequence":"additional","affiliation":[{"name":"Department of Maxillofacial Anatomy Graduate School of Tokyo Medical and Dental University  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7181-5475","authenticated-orcid":false,"given":"Gen","family":"Murakami","sequence":"additional","affiliation":[{"name":"Division of Internal Medicine Jikoukai Clinic of Home Visit  Sapporo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0302-7658","authenticated-orcid":false,"given":"Shogo","family":"Hayashi","sequence":"additional","affiliation":[{"name":"Department of Anatomy School of Medicine International University of Health and Welfare  Narita Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5423-4492","authenticated-orcid":false,"given":"Jos\u00e9 F.","family":"Rodr\u00edguez\u2010V\u00e1zquez","sequence":"additional","affiliation":[{"name":"Department of Anatomy and Embryology Faculty of Medicine Complutense University  Madrid Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2019,10,14]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-0-323-05385-3.50019-2"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/ca.22996"},{"key":"e_1_2_6_4_1","first-page":"71","article-title":"The position of the human cecum in fetal life","volume":"109","author":"Fitzgerald MJ","year":"1971","journal-title":"J Anat"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/ar.23930"},{"key":"e_1_2_6_6_1","first-page":"1023","article-title":"Position of the 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