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



Embryology of gut
Embryology of Gut embryo to form the gut.


Lung buds from the gut
Lung Buds from the Gut embryo to form the gut.


Stages of lung development
Stages of Lung Development embryo to form the gut.


Physiological hernia
Physiological hernia embryo to form the gut.

  • 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


  • Complex adult layout due to 270 embryo to form the gut.o 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 embryo to form the gut.

Front

Dorsal

Mesentary

Ventral

Mesentary

Back

Splenic

tissue

Omentum

Epiploic

Foramen


Liver and spleen form in mesentary
Liver and spleen form in mesentary embryo to form the gut.

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


Formation of omentum
Formation of Omentum embryo to form the gut.


90 degrees rotation
90 degrees rotation embryo to form the gut.


180 degrees rotation
180 degrees rotation embryo to form the gut.


Final 90 270 degrees in total
Final 90 - 270 degrees in total embryo to form the gut.


Blood supply of the gut
Blood Supply of the Gut embryo to form 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 embryo to form the gut.

    • Celiac trunk

  • Foregut

  • Midgut

    • Superior mesenteric artery

  • Hindgut

    • Inferior mesenteric artery

  • Rectum

    • Internal iliac artery (pudendal and rectal arteries)


  • Canalisation of the gut
    Canalisation of the Gut embryo to form the gut.


    Peritoneum
    Peritoneum embryo to form the gut.

    • 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:- embryo to form the gut.

    • 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 embryo to form the gut.

    • 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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