Gastrointestinal Tract Development

Introduction

The gastrointestinal tract (GIT) extending from the buccopharyngeal membrane to the cloacal membrane arises from the endoderm of the trilaminar embryo (week 2, 3).

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. 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. On this current page there is a brief developmental overview and stage 13/14 embryo overview.

The oral cavity (mouth) is formed following breakdown of the buccopharyngeal membrane (=oropharyngeal) 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. (More? Sensory Development - Taste | Head and Neck Development - Tongue)

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 (More? Respiratory Development)

--Mark Hill 09:25, 14 April 2010 (EST) Page Template only - content from original UNSW Embryology site currently being edited and updated.

Historic Embryology - Gastrointestinal Tract
1878 Alimentary Canal \| 1882 The Organs of the Inner Germ-Layer The Alimentary Tube with its Appended Organs \| 1884 Great omentum and transverse mesocolon \| 1902 Meckel's diverticulum \| 1902 The Organs of Digestion \| 1903 Submaxillary Gland \| 1906 Liver \| 1907 Development of the Digestive System \| 1907 Atlas \| 1907 23 Somite Embryo \| 1908 Liver \| 1908 Liver and Vascular \| 1910 Mucous membrane Oesophagus to Small Intestine \| 1910 Large intestine and Vermiform process \| 1911-13 Intestine and Peritoneum - Part 1 \| Part 2 \| Part 3 \| Part 5 \| Part 6 \| 1912 Digestive Tract \| 1912 Stomach \| 1914 Digestive Tract \| 1914 Intestines \| 1914 Rectum \| 1915 Pharynx \| 1915 Intestinal Rotation \| 1917 Entodermal Canal \| 1918 Anatomy \| 1921 Alimentary Tube \| 1932 Gall Bladder \| 1939 Alimentary Canal Looping \| 1940 Duodenum anomalies \| 2008 Liver \| 2016 GIT Notes \| Historic Disclaimer
Human Embryo: 1908 13-14 Somite Embryo \| 1921 Liver Suspensory Ligament \| 1926 22 Somite Embryo \| 1907 23 Somite Embryo \| 1937 25 Somite Embryo \| 1914 27 Somite Embryo \| 1914 Week 7 Embryo
Animal Development: 1913 Chicken \| 1951 Frog

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Cite this page: Hill, M.A. (2024, May 6) Embryology Gastrointestinal Tract Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Gastrointestinal_Tract_Development

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