Embryology of the GIT II - Midgut (Easy to Understand)
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- เผยแพร่เมื่อ 8 ก.ย. 2024
- The development of the midgut explained very simply!
If you are completely new to embryology and you want to understand it quickly, this should be the first video you watch:
- • Introduction to Embryo...
Post any questions you have about the video below, I read all the comments:
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Easy Embryology is a book that is dedicated to the simplification of embryology. It is available at drminass.com/p.... Contact Dr. Minass for more information.
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Summary for your notes:
- midgut communicates with the yolk sac with the vitelline duct (yolk stalk)
- midgut begins in the grown human distal to the entrance of the bile duct into the duodenum, until the junction between the proximal 2/3 of the transverse colon and the distal 1/3.
- midgut is supplied by superior mesenteric artery]
- midgut rapidly elongates forming a primary intestinal loop
- cephalic limb of the loop becomes the distal duodenum, jejunum, and some of the ileum
- caudal portion becomes the rest of the ileum, caecum, appendix, ascending colon, and proximal 2/3 of the transverse colon
- the midgut rotates 90 degrees during physiological herniation (counter-clockwise)
- when the intestinal loops retract into the abdominal cavity due to liver growth declining and an increased cavity, the midgut rotates another 180 degrees
- initially the cecum is in the right upper quadrant (RUQ), but it descends into the iliac fossa (RIF)
Abnormalities:
- gastroschisis, Meckel's diverticulum (persitence of the vitelline duct), volvulus (malrotation: only 90 degrees instead of 270, leading to bowel being retracted first and therefore being on the left side), atresia and stenosis