Gastrointestinal Tract Development
|Embryology - 23 Mar 2019 Expand to Translate|
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- 1 Introduction
- 2 Some Recent Findings
- 3 Textbooks
- 4 Objectives
- 5 Germ Layer Contributions
- 6 Gastrointestinal Tract Movies
- 7 3 GIT divisions
- 8 Development Overview
- 9 Carnegie stage 13 Embryo Overview
- 10 Innervation
- 11 Associated Organs
- 12 Gastrointestinal Tract Abnormalities
- 13 Molecular
- 14 References
- 15 Additional Images
- 16 Terms
- 17 Glossary Links
The gastrointestinal tract (GIT) arises initially during the process of gastrulation from the endoderm of the trilaminar embryo (week 3) and extends from the buccopharyngeal membrane to the cloacal membrane. The tract and associated organs later have contributions from all the germ cell layers.
During the 4th week three distinct regions (fore-, mid- and hind-gut) extend the length of the embryo and will contribute different components of the GIT. The large mid-gut is generated by lateral embryonic folding which "pinches off" a pocket of the yolk sac, the 2 compartments continue to communicate through the vitelline duct.
The oral cavity (mouth) is formed following breakdown of the buccopharyngeal membrane (oropharyngeal or oral membrane) and contributed to mainly by the pharynx lying within the pharyngeal arches (More? Head Development). Loss of buccopharyngeal membrane opens the tract to amniotic fluid through the remainder of development, and during the fetal period is actively swallowed.
From the oral cavity the next portion of the foregut is initially the pharynx, a single gastrointestinal (oesophagus) and respiratory (trachea) common tube, that lies behind the heart. Note that the respiratory tract will form from a ventral bud arising at this level (More? respiratory).
This current page provides an introductory overview, use the links below for descriptions of specific components and regions as well as developmental abnormalities.
Note that in historic texts the term entoderm is used to describe endoderm and other terminology may also differ from current descriptions.
Some Recent Findings
|More recent papers|
This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
|These papers originally appeared in the Some Recent Findings table, but as that list grew in length have now been shuffled down to this collapsible table.
- Human Embryology Larson Chapter 9 p229-260
- The Developing Human: Clinically Oriented Embryology (6th ed.) Moore and Persaud Chapter 12 p271-302
- Before We Are Born (5th ed.) Moore and Persaud Chapter 13 p255-287
- Essentials of Human Embryology Larson Chapter 9 p123-146
- Human Embryology Fitzgerald and Fitzgerald Chapter 19,20 p119-123
|You have access the following online Embryology resources and textbooks through the UNSW Library.|
|Hill, M.A. (2019). UNSW Embryology (19th ed.) Retrieved March 23, 2019, from https://embryology.med.unsw.edu.au
|Moore, K.L., Persaud, T.V.N. & Torchia, M.G. (2015). The developing human: clinically oriented embryology (10th ed.). Philadelphia: Saunders. (links only function with UNSW connection)
Chapter 11 Alimentary System
|Schoenwolf, G.C., Bleyl, S.B., Brauer, P.R., Francis-West, P.H. & Philippa H. (2015). Larsen's human embryology (5th ed.). New York; Edinburgh: Churchill Livingstone.(links only function with UNSW connection)
Chapter 14 Development of the Gastrointestinal Tract
- Understanding of germ layer contributions to the early gastrointestinal tract (GIT)
- Understanding of the folding of the GIT
- Understanding of three main GIT embryonic divisions
- Understanding of associated organ development (liver, pancreas, spleen)
- Brief understanding of mechanical changes (rotations) during GIT development
- Brief understanding of gastrointestinal abnormalities
Germ Layer Contributions
- Endoderm - epithelium and associated glands
- Mesoderm (splanchnic) - mesentry, connective tissues, smooth muscle, blood vessels
- Ectoderm (neural crest) - enteric nervous system (neural tube) - extrinsic innervation
Both endoderm and mesoderm will contribute to associated organs.
Gastrointestinal Tract Movies
|Gastrointestinal Tract Movies|
|Stage 13 (week 5)||Stage 22 (week 8)||Stage 23 (week 8)||GIT Abnormalities Ultrasound|
3 GIT divisions
During the 4th week the 3 distinct portions (fore-, mid- and hind-gut) extend the length of the embryo and will contribute different components of the GIT. These 3 divisions are also later defined by the vascular (artery) supply to each of theses divisions.
The large mid-gut is generated by lateral embryonic folding which "pinches off" a pocket of the yolk sac, the 2 compartments continue to communicate through the vitelline duct.
The oral cavity (mouth) is formed following breakdown of the buccopharyngeal membrane (oropharyngeal, oral membrane) and contributed to mainly by the pharynx lying within the pharyngeal arches. The opening of the GIT means that it contains amniotic fluid, which is also swallowed later in development.
From the oral cavity the next portion of the foregut is initially a single gastrointestinal (oesophagus) and respiratory (trachea) common tube, the pharynx which lies behind the heart. Note that the respiratory tract will form from a ventral bud arising at this level.
- Oral cavity
- Pharynx (esophagus, trachea)
- Respiratory tract
From beneath the stomach the initial portion of the small intestine, the duodenum, and the associated pancreas now lie.
Much of the midgut is herniated at the umbilicus external to the abdomen through development. A key step in development is the rotation of this midgut that must occur to place the GIT in the correct abdominal position with its associated mesentry. The GIT itself differentiates to form significantly different structures along its length: oesophagus, stomach, duodenum, jejunum, iliem (small intestine), colon (large intestine).
The mesentries of the GIT are generated from the common dorsal mesentry, with the ventral mesentry contributing to the lesser omentum and falciform ligament.
The hindgut region initially contributes the cloaca, that will contribute the distal transverse colon, descending colon, sigmoid colon, rectum. Located at the hindgut inferior end is the cloacal membrane, an early transient structure, that degenerates after cloacal septation.
The initial cloaca is the common early hindgut space that will later become partitioned by a septum into a dorsal gastrointestinal component (rectum) and ventral renal/genital component (urogenital sinus).
GIT shown in green anchored by dosal and ventral mesogastrium. The space ouside this will be the peritoneal cavity.
Red ring - neural tube with neural crest Blue ring - notocord Orange - somites
Differentiation of associated organs at the level of the forming stomach occurs both dorsally (spleen) and ventrally (liver).
Large blue ring - dorsal aorta Dark green ring - liver
Continued growth of the GIT and the organs leads to organ movements and bending of tract.
Carnegie stage 13 Embryo Overview
Below is an overview of the sections starting at the level of pharynx compressed dorsoventrally, following the GIT through to the rectum. The most obvious feature is that of a continuous tube initially, attached by dorsoventral mesentry. Outside this tube and mesentry (at the levels below the lung buds) is the intraembryonic coelom that will form the peritoneal cavity. The hepatic diverticulum (liver bud) lies under the septum transversum is the earliest associated GIT organ that has differentiated, and now occupies a substantial region of the abdomen. Clicking on sections below will open the original images.
|Bifurcation of the pharynx into anterior respiratory and posterior oesophagous.||The stomach forming beneath the lung buds and adjacent to the developing liver.||Below the stomach the GIT has a large dorsal mesogastrium and finer ventral mesogastrium. Associated with the tract is the large portal blood vessel derived from the vitelline circulation.||At the bottom curvature of the embryo the mesentry association with the GIT shows extensive vitelline vessels running out through the umbilicus. The hindgut can then be seen, ending at the common urogenital sinus, the cloaca.|
The gastrointestinal tract has both intrinsic and extrinsic innervation. (see the recent review)
- The intrinsic innervation, the enteric plexus, is derived from neural crest cells migrating into and along the wall of the gastrointestinal tract.
- mainly vagal region neural crest - generating both neurons and glia.
- some sacral neural crest - in chicken.
- The extrinsic innervation occurs by efferent and afferent nerves, from the vagus and sympathetic chain and pelvic nerves.
- Vagus - sensory and motor fibers project from oesophagus to small intestine.
- Sympathetic and parasympathetic - lower oesophagus to large intestine.
- Pelvic nerves - large intestine, rectum.
|Myenteric plexus||Submucosal plexus|
|Auerbach's plexus||Meissner's plexus|
|Leopold Auerbach (1828–1897) a German anatomist and neuropathologist.||Georg Meissner (1829–1905) a German anatomist and physiologist.|
|Links: enteric nervous system | intestine | neural crest | PMID 25428846|
- 1857 Meissner was the first to describe a nerve plexus in the submucosa of the bowel wall.
- 1864 Auerbach described the myenteric plexus between the longitudinal and circular muscle layers.
- 1981 LeDouarin describes neural crest contribution to both plexuses.
- Coordinated waves of descending inhibition followed by waves of descending excitation
+ Extrinsic parasympathetic cholinergic nerves (vagal and sacral) excite peristalsis and stimulate
- Sympathetic noradrenergic nerves inhibit the transit of gut contents
- epithelial movements
- secretion and absorption
- Links: neural crest
The early tract develops as a simple tube, then a number of endodermal outgrowths from this tube at different levels and contribute to a range of additional organs and tissues. The gastrointestinal associated organs liver, gall bladder and pancreas. Development of these organs is described on separate pages.
Gastrointestinal Tract Abnormalities
Only a brief description is given on this current page, for more details see Gastrointestinal Tract - Abnormalities.
There are several types of abnormalities that impact upon the continuity of the gastrointestinal tract lumen.
- Atresia - interuption of the lumen (esophageal atresia, duodenal atresia, extrahepatic biliary atresia, anorectal atresia)
- Stenosis - narrowing of the lumen (duodenal stenosis, pyloric stenosis).
- Duplication - incomplete recanalization resulting in parallel lumens, this is really a specialized form of stenosis.
This GIT abnormality is a very common and results from improper closure and absorption of the omphalomesenteric duct (vitelline duct) in development. This transient developmental duct connects the yolk to the primitive GIT.
- Links: Intestinal Malrotation
(intestinal aganglionosis, Hirschsprung's disease, aganglionic colon, megacolon, congenital aganglionic megacolon, congenital megacolon) A condition caused by the lack of enteric nervous system (neural ganglia) in the intestinal tract responsible for gastric motility (peristalsis).
Gastroschisis (omphalocele, paraomphalocele, laparoschisis, abdominoschisis, abdominal hernia) is a congenital abdominal wall defect which results in herniation of fetal abdominal viscera (intestines and/or organs) into the amniotic cavity. Incidence of gastroschisis has been reported at 1.66/10,000, occuring more frequently in young mothers (less than 20 years old).
By definition, it is a body wall musculoskeletal defect, not a gastrointestinal tract defect, which in turn impacts upon GIT development.
The endoderm of the developing gastrointestinal tract is a source for patterning signals for both within the tract and also for the surrounding organs and tissues.
- Sox2 - expressed in the anterior part of the primitive gut
- Cdx2 - expressed in the posterior part of the primitive gut
- GDNF - regulate migration of enteric neural crest cells
- endothelin - regulate migration of enteric neural crest cells
- Davis A, Amin NM, Johnson C, Bagley K, Ghashghaei HT & Nascone-Yoder N. (2017). Stomach curvature is generated by left-right asymmetric gut morphogenesis. Development , 144, 1477-1483. PMID: 28242610 DOI.
- Ueno S, Yamada S, Uwabe C, Männer J, Shiraki N & Takakuwa T. (2016). The Digestive Tract and Derived Primordia Differentiate by Following a Precise Timeline in Human Embryos Between Carnegie Stages 11 and 13. Anat Rec (Hoboken) , 299, 439-49. PMID: 26995337 DOI.
- Vestentoft PS, Jelnes P, Hopkinson BM, Vainer B, Møllgård K, Quistorff B & Bisgaard HC. (2011). Three-dimensional reconstructions of intrahepatic bile duct tubulogenesis in human liver. BMC Dev. Biol. , 11, 56. PMID: 21943389 DOI.
- Dames P, Puff R, Weise M, Parhofer KG, Göke B, Götz M, Graw J, Favor J & Lechner A. (2010). Relative roles of the different Pax6 domains for pancreatic alpha cell development. BMC Dev. Biol. , 10, 39. PMID: 20377917 DOI.
- Uesaka T, Young HM, Pachnis V & Enomoto H. (2016). Development of the intrinsic and extrinsic innervation of the gut. Dev. Biol. , 417, 158-67. PMID: 27112528 DOI.
- Burns AJ, Champeval D & Le Douarin NM. (2000). Sacral neural crest cells colonise aganglionic hindgut in vivo but fail to compensate for lack of enteric ganglia. Dev. Biol. , 219, 30-43. PMID: 10677253 DOI.
- Raghoebir L, Bakker ER, Mills JC, Swagemakers S, Kempen MB, Munck AB, Driegen S, Meijer D, Grosveld F, Tibboel D, Smits R & Rottier RJ. (2012). SOX2 redirects the developmental fate of the intestinal epithelium toward a premature gastric phenotype. J Mol Cell Biol , 4, 377-85. PMID: 22679103 DOI.
- Goto A, Sumiyama K, Kamioka Y, Nakasyo E, Ito K, Iwasaki M, Enomoto H & Matsuda M. (2013). GDNF and endothelin 3 regulate migration of enteric neural crest-derived cells via protein kinase A and Rac1. J. Neurosci. , 33, 4901-12. PMID: 23486961 DOI.
- Developmental Biology (6th ed) Gilbert, Scott F. Sunderland (MA): Sinauer Associates, Inc.; c2000. The Digestive Tube and Its Derivatives | Endodermal development of a human embryo
- The Gastrointestinal Circulation Peter R. Kvietys. San Rafael (CA): Morgan & Claypool Publishers; 2010. Table of Contents
- Motor Function of the Pharynx, Esophagus, and its Sphincters. Mittal RK. San Rafael (CA): Morgan & Claypool Life Sciences; 2011. Table of Contents
- Search NLM Online Textbooks "gastrointestinal tract" : Developmental Biology | Endocrinology | Molecular Biology of the Cell | The Cell- A molecular Approach
- The Elements of Embryology by Foster, M., Balfour, F. M., Sedgwick, A., & Heape, W. (1883) The Alimentary Canal and its Appendages
- Text-Book of the Embryology of Man and Mammals by Dr Oscar Hertwig (1892) The Organs of the Inner Germ-Layer The Alimentary Tube with its Appended Organs
- Atlas of the Development of Man Volume 2 by Julius Kollmann (1907) Gastrointestinal
- Text-Book of Embryology by Bailey, F.R. and Miller, A.M. (1921) Alimentary tube and organs
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Le Guen L, Marchal S, Faure S & de Santa Barbara P. (2015). Mesenchymal-epithelial interactions during digestive tract development and epithelial stem cell regeneration. Cell. Mol. Life Sci. , 72, 3883-96. PMID: 26126787 DOI.
Browning KN & Travagli RA. (2014). Central nervous system control of gastrointestinal motility and secretion and modulation of gastrointestinal functions. Compr Physiol , 4, 1339-68. PMID: 25428846 DOI.
Hao MM, Bornstein JC, Vanden Berghe P, Lomax AE, Young HM & Foong JP. (2013). The emergence of neural activity and its role in the development of the enteric nervous system. Dev. Biol. , 382, 365-74. PMID: 23261929 DOI.
Burns AJ, Roberts RR, Bornstein JC & Young HM. (2009). Development of the enteric nervous system and its role in intestinal motility during fetal and early postnatal stages. Semin. Pediatr. Surg. , 18, 196-205. PMID: 19782301 DOI.
Neu J. (2007). Gastrointestinal development and meeting the nutritional needs of premature infants. Am. J. Clin. Nutr. , 85, 629S-634S. PMID: 17284768
Ueno S, Yamada S, Uwabe C, Männer J, Shiraki N & Takakuwa T. (2016). The Digestive Tract and Derived Primordia Differentiate by Following a Precise Timeline in Human Embryos Between Carnegie Stages 11 and 13. Anat Rec (Hoboken) , 299, 439-49. PMID: 26995337 DOI.
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Cite this page: Hill, M.A. (2019, March 23) Embryology Gastrointestinal Tract Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Gastrointestinal_Tract_Development
- © Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G