Development of the Abdomen Flashcards Preview

S&F IV: Exam One > Development of the Abdomen > Flashcards

Flashcards in Development of the Abdomen Deck (16):
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Esophagus Formation

The respiratory diverticulum expands to form the esophagotracheal ridge which will grow inward separating the pharynx into two longitudinal tubes

1

Stomach Development

Begins as a dilation in the gut tube and the dorsal surface will grow fast and rotate 90 degrees clockwise making the greater curvature end up on the left

*This rotation leads to the formation of the lesser sac

2

Vagal Trunk Composition

Anterior is primarily left and posterior to stomach is primarily right

*Due to rotation of the stomach during development

3

Liver development

Begins as the hepatic diverticulum off the gut tube and pushes into the septum transversum becoming suspended in the foregut and anterior abdominal wall

*Septum transversum pulled along during development becomes the ventral mesentary

4

Falciform ligament

Liver to anterior abdominal wall

*Carries the abdominal vein

5

Central tendon of the diaphragm

Derived from the septum transversum and is in direct contact w/ the bare area of the liver

6

Gall Bladder development

Arises from the hepatic diverticulum; common stalk of the liver connected to the gall bladder and ventral pancreas becomes the common bile duct

7

Pancreas Development

Ventral pancreas arises from hepatic diverticulum and dorsal develops of the duodenum

=> Fuse in week 6; ventral bud becomes main pancreatic duct and dorsal bud becomes accessory duct

*Growth of the dorsal duodenal wall pushes the ventral pancreas and bile duct dorsally


8

Annular Pancreas

Congenital abnormality characterized by a ring of pancreatic tissue from the ventral bud surrounding the duodenum

*Causes intestinal obstruction

9

Spleen Developent

Independent condensation of mesoderm b/w the dorsal mesentary of the stomach

10

Gastroschisis

Ventral body wall defect causing herniation of the intestinal loops into the amniotic cavity

*Failure of body wall to close; viscera are NOT covered in peritoneum

11

Omphalocele

Ventral wall defect caused by failure of the intestines to return to the abdominal cavity after physiological umbilical herniation

*Intestines are covered by peritoneum

12

Midgut Development

During physiological umbilical herniation, the intestines rotate 90 degrees counterclockwise around the superior mesenteric artery; when the return to the abdomen, they rotate another 180 degrees and the proximal end enters the upper left part of the abdominal cavity

*Cecum forms as swelling on the caudal loop during this timeframe (4-10 weeks)

13

Hindgut development

The urogenital septum grows b/w the hindgut and allantois dividing the cloaca into the urogenital sinus and the anorectal canal

=> The proctodeum will push inward on the anorectal canal to form the distal opening of the tube

14

Pectinate Line

Separation b/w regions of the anal canal formed by the cloaca and the proctodeum `

15

Innervation and Blood Supply to the anal canal

Superior to Pectinate Canal: Blood- Inferior Mesenteric Arteries
Nerves- Autonomic

Inferior to Pectinate Canal: Blood- Internal Iliac Artery
Nerves: Spinal nerves