Download - Development of Mesentry
![Page 1: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/1.jpg)
Mesentry Development
Dr Iram Iqbal
![Page 2: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/2.jpg)
Mesentry is a double layer of peritoneum that enclose an organ and
connect it to the body wall
Provide pathways for vessels, nerves and lymphatics
![Page 3: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/3.jpg)
![Page 4: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/4.jpg)
Parts of developing GIT
• Pharyngeal gut• Fore gut• Mid gut• Hind gut
![Page 5: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/5.jpg)
![Page 6: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/6.jpg)
Mesentery Development
• During embryonic development digestive tract and accessory organs are suspended in peritoneal cavity by:
dorsal mesentery ventral mesentery
![Page 7: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/7.jpg)
THE DORSAL MESENTERY
• Extends from lower end of esophagus to the cloacal region of the hind gut
• Derived from splanchnic mesoderm
• In region of stomach- The dorsal mesogastrium or greater omentum
• Duodenum-The dorsal mesoduodenum
• Jejunum & ileum- mesentery proper
• Colon- The dorsal mesocolon
![Page 8: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/8.jpg)
Ventral mesentery
![Page 9: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/9.jpg)
Mesenteries of the Stomach
![Page 10: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/10.jpg)
![Page 11: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/11.jpg)
Primitive Dorsal Mesogastrium
![Page 12: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/12.jpg)
Appearance of the Omental Bursa
![Page 13: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/13.jpg)
![Page 14: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/14.jpg)
Development of Spleen
![Page 15: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/15.jpg)
Elongation of the Dorsal mesogastrium and expansion of the Omental bursa
![Page 16: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/16.jpg)
Formation of Greater Omentum
![Page 17: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/17.jpg)
Mesentry of duodenum
![Page 18: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/18.jpg)
Rotation of stomach causes C shaped duodenum and it rotates to the left.
Duodenum and pancreas become retroperitoneal, Except for Duodenal Cap.
![Page 19: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/19.jpg)
Mesentry of Liver
![Page 20: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/20.jpg)
Mesentry of Pancreas
![Page 21: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/21.jpg)
Mesentries of mid gut
• Rotation of intestinal loop cause twist in dorsal mesentry.
• Ascending colon becomes Retro perotoneal.
• Transverse Mesocolon fuses with posterior wall of Greater Omentum
![Page 22: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/22.jpg)
![Page 23: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/23.jpg)
![Page 24: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/24.jpg)
![Page 25: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/25.jpg)
Mesentry of Hindgut
• Dorsal Mesentry forms Sigmoid Mesocolon.
• Rectum is only partially covered by the peritoneum.
![Page 26: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/26.jpg)
Mesenteries of Digestive Organs
![Page 27: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/27.jpg)
References
1. Langman’s Medical Embryology, 10th edition.
2. Moore Persaud, The Developing Human, Clinically Oriented Embryology, 8th edition.
3. Google search for images
![Page 28: Development of Mesentry](https://reader033.vdocument.in/reader033/viewer/2022051413/553e1c744a79591e258b48af/html5/thumbnails/28.jpg)