Gastrointestinal Tract - Stomach Development: Difference between revisions
Line 38: | Line 38: | ||
== Greater Omentum == | == Greater Omentum == | ||
The greater omentum hangs like an apron over the small intestine and transverse colon. It begins attacted to the inferior end of the stomach as a fold of the dorsal mesogastrium which later fuses to form the structure we recognise anatomically. The figure below shows a lateral view of this process comparing the early second trimester arrangement with the newborn structure. | The greater omentum hangs like an apron over the small intestine and transverse colon. It begins attacted to the inferior end of the stomach as a fold of the dorsal mesogastrium which later fuses to form the structure we recognise anatomically. The figure below shows a lateral view of this process comparing the early second trimester arrangement with the newborn structure. | ||
== Duodenum/Pancreas Rotation == | |||
After the stomach the initial portion of the GIT tube is the duodenum which initially lies in the midline within the peritoneal cavity, but then (along with the attached pancreas) undergoes rotation to become a retroperitoneal structure. | |||
The diagram below shows this rotation with spinal cord at the top, vertebral body then dorsal aorta then pertioneal wall and cavity. | |||
==References== | ==References== |
Revision as of 08:29, 22 August 2010
Introduction
This section of notes gives an overview of how the stomach and duodenum develops. The GIT is best imagined as a simple tube, the upper part being the foregut diverticulum, which is further divided into oesophagus and stomach.
During week 4 at the level where the stomach will form the tube begins to dilate, forming an enlarged lumen. The dorsal border grows more rapidly than ventral, which establishes the greater curvature of the stomach. A second rotation (of 90 degrees) occurs on the longitudinal axis establishing the adult orientation of the stomach.
Some Recent Findings
Components of Stomach Formation
primitive endoderm
- foregut diverticulum (pocket)
- pharyngeal region of foregut
- laryngo-tracheal groove (see respiratory tract)
- oesophageal region of foregut
- oesophagus
- stomach
- glandular/proventricular/pyloric stenosis
- fundus/pyloric antrum
- pyloric sphincter
- fundus/pyloric antrum
- dorsal mesogastrium
- lieno-renal ligament
- splenic primordium
- spleen
- gastro-splenic ligament
- duodenum (rostral half)
- splenic primordium
- lieno-renal ligament
- glandular/proventricular/pyloric stenosis
- stomach
- oesophagus
- pharyngeal region of foregut
- foregut-midgut junction
- midgut region
- hindgut diverticulum (pocket)
Modified from [1]
Greater Omentum
The greater omentum hangs like an apron over the small intestine and transverse colon. It begins attacted to the inferior end of the stomach as a fold of the dorsal mesogastrium which later fuses to form the structure we recognise anatomically. The figure below shows a lateral view of this process comparing the early second trimester arrangement with the newborn structure.
Duodenum/Pancreas Rotation
After the stomach the initial portion of the GIT tube is the duodenum which initially lies in the midline within the peritoneal cavity, but then (along with the attached pancreas) undergoes rotation to become a retroperitoneal structure.
The diagram below shows this rotation with spinal cord at the top, vertebral body then dorsal aorta then pertioneal wall and cavity.
References
- ↑ Kaufman & Bard, The Anatomical Basis of Mouse Development, 1999 Academic Press
Search Pubmed
Search Bookshelf: Stomach Development
Search Pubmed Now: Stomach Development
Images
Glossary Links
- Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link
Cite this page: Hill, M.A. (2024, April 26) Embryology Gastrointestinal Tract - Stomach Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Gastrointestinal_Tract_-_Stomach_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G