embryology of the gut and lungs
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Embryology of the Gut and Lungs. 212 Functional Anatomy Stuart Bunt. Embryonic Curvature traps part of the yolk sac inside the embryo to form the gut. Embryology of Gut. Lung Buds from the Gut. Stages of Lung Development. Physiological hernia. The large liver takes up abdominal space

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embryology of the gut and lungs

Embryology of the Gut and Lungs

212 Functional Anatomy

Stuart Bunt

physiological hernia
Physiological hernia
  • The large liver takes up abdominal space
  • Intestine lengthens into umbilicus
  • Rotates as it grows out and again as it re-enters abdomen
    • Omphalocele....no re-entry
    • Umbilical hernia, goes back out covered in peritoneum
slide7
Complex adult layout due to 270o rotation
  • Foregut, Midgut and Hindgut suspended by the dorsal mesentary, initially straight
  • Ventral mesentary connects stomach and ant. abd. wall, rest of gut free anteriorly
  • Mesentary supplies blood and nerves to gut between layers of peritoneum
stomach rotates and distends
Stomach rotates and distends

Front

Dorsal

Mesentary

Ventral

Mesentary

Back

Splenic

tissue

Omentum

Epiploic

Foramen

liver and spleen form in mesentary
Liver and spleen form in mesentary

Anterior

1. Falciform ligament

2. Lesser Omentum

3. Dorsal mesentary, divided into:-

4a. Gastrosplenic ligament

4b. Lienorenal ligament

1

Liver

2

Stomach

4a

Spleen

3

4b

Posterior

blood supply of the gut
Blood Supply of the Gut
    • Celiac trunk
  • Foregut
  • Midgut
    • Superior mesenteric artery
  • Hindgut
    • Inferior mesenteric artery
  • Rectum
    • Internal iliac artery (pudendal and rectal arteries)
blood supply to abdominal organs
Blood Supply to Abdominal Organs
    • Celiac trunk
  • Foregut
  • Midgut
    • Superior mesenteric artery
  • Hindgut
    • Inferior mesenteric artery
  • Rectum
    • Internal iliac artery (pudendal and rectal arteries)
peritoneum
Peritoneum
  • Flattened endothelial cells on fibro-elastic connective tissue
  • Parietal and visceral layers
  • Makes gut watertight
  • Suspends gut
  • Contains nerves and blood vessels
  • Omentum contains infection

Flattened Endothelial cell

mesenteries are important
Mesenteries are important:-
  • Paracolic gutters channel fuid
  • Stop herniation due to bipedal posture
  • Supply blood/nerves
  • Sensitive to stretch
  • Contain infection
  • Useful in surgery
intra and retroperitoneal
Intra and Retroperitoneal
  • To prevent the intestines falling into the pelvis our upright posture has been accompanied by a fusion of parts of the gut tube to the posterior abdominal wall. These parts become retro-peritoneal.
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