GI Embryo Flashcards
What is the Vitelline duct?
Narrow connection of the midgut to the yolk sac
What is the Cloaca?
- Expanded region of Hindgut
- Membrane coverings future butthole
What forms the foregut region?
Mouth to Proximal duodenum
What forms the midgut?
Distal Small intestine to proximal 3/2 of transverse colon
What makes up the hindgut?
Last 1/3 transverse colon to anal canal
What is the blood supply and innervations of the foregut?
Blood: Celiac Trunk
Parasympathetic: Vagus
Sympathetic Pregang: Greater Splanchnic
Symp Postgang: Celiac ganglion
What is the blood supply and innervations of the Midgut?
Blood: Superior mesenteric artery
Parasympathetic: Vagus
Sympathetic Pregang: Lesser Splanchnic Nerves
Symp Postgang: Superior Mesenteric Ganglion
What is the blood supply and innervations of the hindgut?
Blood: Inferior mesenteric artery
Parasympathetic: Pelvic splanchnic nerves
Sympathetic Pregang: Lumbar Splanchnic Nerves
Symp Postgang: Inferior Mesenteric Ganglion
What is Atresia?
Absence or closure of an orifice or passage
What is the most common atresia in a developing fetus?
Duodenal atresia
- Enlarged uterus f/ polyhydramnios
- Distended stomach and duodenum up to atresia
Which week does the respiratory bud appear?
Week 4
What is the most common defect is the respiratory system in the developing fetus?
- Trachoesophageal fistula in distal third of trachea
- Blind ending of esophagus
- Polyhydramnios
What is the most common defect is development of liver and gallbladder?
- Failure Of bile ducts to develop or recanalize —> Biliary atresia/stenosis
- More Common in extrahepatic ducts
What is an annular pancreas?
when the ventral pancreatic bud splits and encircles the duodenum (forming a ring), constricting the lumen, leading to duodenal stenosis or atresia.
What is congenital pyloric stenosis?
Hypertrophy of the smooth muscle of the pyloric sphincter of the stomach wall.
1 in 150 males
