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Ten birds were included in the study. The obtained findings revealed that three parts in the small intestine namely duodenum, jejunum, and ilium constituted of four layers from innermost to outermost including tunica mucosa, tunica submucosa, tunica muscularis, and tunica serosa. All parts of the small intestine had simple columnar epithelium with goblet cells reacted with Periodic Acid\u2010Schiff and Alcian Blue stains especially in the jejunum and ileum. The cells on the tip of the duodenal villi showed immuno\u2010positive staining for Sox9 protein, while the jejunum and ileum were negative. The jejunum had longest villi; however the duodenum had deepest crypt (<jats:italic>p<\/jats:italic>\u00a0&lt;\u2009.05). The villus surface of jejunum was significantly higher than duodenum and ileum (<jats:italic>p<\/jats:italic>\u00a0&lt;\u2009.05). SEM images revealed that the duodenum had cauliflower and leaf\u2010like villi with plicas and recess between them. Jejunum had finger\u2010like villi with a velvety view. The shape of the ileal villi was like that observed in the jejunum with slight differences. In conclusion, the jejunum was the most prominent region in the small intestine in terms of morphologic and morphometric features, which could be attributed to the absorption of more nutrients in this area. These obtained findings would be useful to improve the knowledge in the field of histophysiology properties of the bird's digestive system.<\/jats:p>","DOI":"10.1002\/jemt.23794","type":"journal-article","created":{"date-parts":[[2021,4,28]],"date-time":"2021-04-28T01:14:06Z","timestamp":1619572446000},"page":"2388-2398","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Histology of the small intestine in the common pheasant (<scp><i>Phasianus colchicus<\/i><\/scp>): A scanning electron microscopy, histochemical, immunohistochemical, and stereological study"],"prefix":"10.1002","volume":"84","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4704-6076","authenticated-orcid":false,"given":"Nader","family":"Goodarzi","sequence":"first","affiliation":[{"name":"Department of Basic Sciences and Pathobiology, Faculty of Veterinary Medicine Razi University  Kermanshah Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohsen","family":"Akbari Bazm","sequence":"additional","affiliation":[{"name":"Department of Anatomical Sciences Medical School, Kermanshah University of Medical Sciences  Kermanshah Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sadra","family":"Poladi","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine Razi University  Kermanshah Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatemeh","family":"Rashidi","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine Razi University  Kermanshah Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bahareh","family":"Mahmoudi","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine Razi University  Kermanshah Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3289-1982","authenticated-orcid":false,"given":"Mohamed M. A.","family":"Abumandour","sequence":"additional","affiliation":[{"name":"Department of Anatomy and Embryology, Faculty of Veterinary Medicine Alexandria University  Alexandria Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,4,27]]},"reference":[{"issue":"2","key":"e_1_2_8_2_1","article-title":"Histological study of gastrointestinal tract in Squacco heron Ardeola ralloides and rock dove Columba livia","volume":"3","author":"Adnan W. A.","year":"2011","journal-title":"Al\u2010Kufa University Journal for Biology"},{"key":"e_1_2_8_3_1","first-page":"453","article-title":"A histochemical study of the stomach and intestine of the chicken","volume":"92","author":"Aitken R.","year":"1958","journal-title":"Journal of Anatomy"},{"key":"e_1_2_8_4_1","unstructured":"Al Sheshani A.S. 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