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Embryology of the Gut and Lungs

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Embryology of the Gut and Lungs. 212 Functional Anatomy. Stuart Bunt ... Embryology of Gut. Lung Buds from the Gut. Stages of Lung Development. Physiological hernia ... – PowerPoint PPT presentation

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Title: Embryology of the Gut and Lungs


1
Embryology of the Gut and Lungs
  • 212 Functional Anatomy
  • Stuart Bunt

2
Embryonic Curvature traps part of the yolk sac
inside the embryo to form the gut.
3
Embryology of Gut
4
Lung Buds from the Gut
5
Stages of Lung Development
6
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

7
  • 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

8
Stomach rotates and distends
Front
Dorsal Mesentary
Ventral Mesentary
Back
Splenic tissue
Omentum
Epiploic Foramen
9
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
Spleen
4a
3
4b
Posterior
10
Formation of Omentum
11
90 degrees rotation
12
180 degrees rotation
13
Final 90 - 270 degrees in total
14
Blood Supply of the Gut
  • Celiac trunk
  • Foregut
  • Midgut
  • Superior mesenteric artery
  • Hindgut
  • Inferior mesenteric artery
  • Rectum
  • Internal iliac artery (pudendal and rectal
    arteries)

15
Blood Supply to Abdominal Organs
  • Celiac trunk
  • Foregut
  • Midgut
  • Superior mesenteric artery
  • Hindgut
  • Inferior mesenteric artery
  • Rectum
  • Internal iliac artery (pudendal and rectal
    arteries)

16
Canalisation of the Gut
17
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
18
Mesenteries are important-
  • Paracolic gutters channel fuid
  • Stop herniation due to bipedal posture
  • Supply blood/nerves
  • Sensitive to stretch
  • Contain infection
  • Useful in surgery

19
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.

20
(No Transcript)
21
Uro-rectal septum divides the bladder and
urogenital sinus from the rectum
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