2.5.1 GI Development Flashcards
What are the two parts of the anal canal?
Hindgut endoderm
— pecinate line —
Anal pit ectoderm
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/386/965/a_image_thumb.png?1489762160)
What acts as the axis of the first primary loop of the midgut?
SMA
What are the hindgut derived GI segments?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/386/915/a_image_thumb.png?1489762018)
Differental growth causes expansion of the stomach into what?
Dorsal mesentary
What are the 6 midgut derived organs?
- Distal half (3rd and 4th) of the duodenum
- Jejunum
- Ileum
- Cecum and appendix
- Ascending colon
- Proximal 2/3 of the transverse colon
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/386/004/a_image_thumb.png?1489761141)
What two extraembryonic structures provide additional features the the primitive gut tube?
yolk sac and allantois
What does the SMA supply blood to?
Midgut and its derivative organs
The ventral mesentary forms from the lower portion of the septum transversum. What structures will this give rise to?
Future lesser omentum and falciform ligament
What this be?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/386/906/q_image_thumb.png?1489761979)
Hirschsprung Dz
What might this be?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/385/449/q_image_thumb.png?1489760263)
Annular pancreas (1 in 15,000)
What are the three phases of midgut development?
- Elongation, herniation, and rotation (90)
- Return to the abdominal cavity and rotation (180)
- Fixation of the mesentaries
What this be?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/386/985/q_image_thumb.png?1489762187)
Imperforate anus
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/386/985/a_image_thumb.png?1489762218)
Identify these two structures
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/384/935/q_image_thumb.png?1489759450)
Left: yolk sac
Right: allantois
What is the classical sign of duodenal atresia on x-ray?
“Double bubble sign”
Also, seen with annular pancreas
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/385/823/a_image_thumb.png?1489760897)
The foregut endoderm proliferates to form buds for what three organs?
liver, gall bladder, and pancreas
What does the dorsal pancreatic bud give rise to?
Future minor duodenal papilla
Identify this conditon
![](https://s3.amazonaws.com/brainscape-prod/system/cm/209/385/739/q_image_thumb.png?1489760694)
Pyloric stenosis
What are some early derivatives of the foregut?
esophagus, stomach, liver, gall bladder, pancreas, 1st and 2nd portions of the duodenum