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Gastrointestinal Tract

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Book cover Color Atlas of Human Fetal and Neonatal Histology

Abstract

The gastrointestinal tract is divided into primary segments (from rostral to caudal): the esophagus, stomach, small intestine, and large intestine. The primary segments are divided into secondary segments (from rostral to caudal): the proximal, middle, and distal parts of the esophagus; the cardia, fundus, body, and antrum or pylorus of the stomach; the duodenum (with its first, second, third, and fourth parts), jejunum, and ileum of the small intestine; and the cecum, appendix, ascending, transverse, descending, sigmoid, rectum, and anal canal segments of the large intestine. The histologic junctions between the primary segments may be abrupt, but those between the secondary segments are gradual transition zones. Sphincters and valves at junctions of primary segments regulate forward propulsion and prevent retrograde flow of the contents. Although the general architecture of the gastrointestinal tract is established in embryonic life, the layers of the wall continue to develop during fetal life. Thus, the histology of the gastrointestinal tract is characterized by numerous changes in the fetal period, which are highlighted in this chapter.

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Acknowledgment

The authors thank Dr. Tricia R. Bhatti from The Children’s Hospital of Philadelphia, Philadelphia, PA, for invaluable assistance in selecting microscopic slides for photography, taking photographs, and editing the original manuscript.

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Correspondence to Chrystalle Katte Carreon .

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Huff, D.S., Carreon, C.K. (2019). Gastrointestinal Tract. In: Ernst, L., Ruchelli, E., Carreon, C., Huff, D. (eds) Color Atlas of Human Fetal and Neonatal Histology. Springer, Cham. https://doi.org/10.1007/978-3-030-11425-1_4

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  • DOI: https://doi.org/10.1007/978-3-030-11425-1_4

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-11424-4

  • Online ISBN: 978-3-030-11425-1

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