Embryology: Digestive System Development - Bicol University, College of Medicine
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Questions and Answers

Which part of the gut tube does the development of the primitive gut into 4 sections include?

  • Foregut, Midgut, and Hindgut (correct)
  • Dorsal Mesentery and Ventral Mesentery
  • Esophagus, Stomach, and Duodenum
  • Liver, Gallbladder, and Pancreas
  • What is the molecular regulation mentioned for liver induction?

  • Sonic Hedgehog (correct)
  • Esophagus
  • Duodenum
  • Mesenteries of the Intestinal Loops
  • What process involves the physiological herniation in the midgut?

  • Rotation of the Midgut (correct)
  • Retraction of Herniated Loops
  • Development of the Foregut
  • Formation of Dorsal Mesentery
  • Which part of the gut tube includes the stomach and esophagus?

    <p>Foregut</p> Signup and view all the answers

    What is the molecular regulation mentioned for pancreas development?

    <p>Molecular Regulation of Pancreas Development</p> Signup and view all the answers

    What is incorporated into the embryo to form the primitive gut?

    <p>A portion of the endoderm</p> Signup and view all the answers

    What is the structure that extends from the left third of the transverse colon to the cloacal membrane known as?

    <p>Hindgut</p> Signup and view all the answers

    Which part of the gut tube forms a blind-ending tube and includes the foregut and hindgut?

    <p>Yolk sac</p> Signup and view all the answers

    What structure gives rise to the epithelial lining of the digestive tract and specific cells of glands like hepatocytes and pancreatic cells?

    <p>Endoderm</p> Signup and view all the answers

    Which section of the primitive gut extends from the oropharyngeal membrane to the respiratory diverticulum and is considered part of the foregut?

    <p>Pharyngeal gut</p> Signup and view all the answers

    What forms a concentration gradient of retinoic acid (RA) that initiates gut tube specification?

    <p>Colon</p> Signup and view all the answers

    The stroma, muscle, and peritoneal components of the gut wall are primarily derived from which structure?

    <p>Visceral Mesoderm</p> Signup and view all the answers

    What structures does the mesoderm of the septum transversum differentiate into?

    <p>Lesser omentum and falciform ligament</p> Signup and view all the answers

    What part of the liver remains uncovered by peritoneum due to its contact with the central tendon of the diaphragm?

    <p>Cranial surface</p> Signup and view all the answers

    What structures form when the anterior and posterior reflections of peritoneum meet on the right and left sides of the bare area of the liver?

    <p>Triangular reflections</p> Signup and view all the answers

    During which week does the weight of the liver decrease from approximately 10% to 5% of the total body weight?

    <p>12th week</p> Signup and view all the answers

    What color do bile contents take on when bile is formed by hepatic cells?

    <p>Dark green</p> Signup and view all the answers

    What positional change causes the entrance of the bile duct to shift from an anterior to a posterior position?

    <p>Positional changes of the duodenum</p> Signup and view all the answers

    What structure divides the ventral mesentery into the lesser omentum and the falciform ligament?

    <p>Liver</p> Signup and view all the answers

    Which peritoneal reflection occurs between the spleen and the left kidney?

    <p>Lienorenal reflection</p> Signup and view all the answers

    Where does the respiratory diverticulum (lung bud) appear at the ventral wall of the foregut?

    <p>Border with the pharyngeal gut</p> Signup and view all the answers

    Which structure gradually partitions the esophagus from the dorsal part of the foregut?

    <p>Tracheoesophageal septum</p> Signup and view all the answers

    What is the layer in apposition to the viscera called in peritoneal anatomy?

    <p>Visceral peritoneum</p> Signup and view all the answers

    Which structure forms a continuous serous membrane lining the inner surface of the abdominal cavity?

    <p>Peritoneum</p> Signup and view all the answers

    Which paired homeobox genes specify the endocrine cell lineage, leading to the formation of B, 8, and *y cells?

    <p>PAX4 and PAX6</p> Signup and view all the answers

    During the 10th week of development, what happens to the herniated intestinal loops?

    <p>They begin to return to the abdominal cavity</p> Signup and view all the answers

    What structure appears as a small conical dilation of the caudal limb of the primary intestinal loop around the sixth week?

    <p>Appendix</p> Signup and view all the answers

    Where is the appendix typically located after its development?

    <p>Posterior to the cecum or colon</p> Signup and view all the answers

    Which mesentery undergoes profound changes with rotation and coiling of the bowel?

    <p>Mesentery proper to the jejunum and ileum</p> Signup and view all the answers

    Which part of the gut is typically the last to reenter the abdominal cavity during development?

    <p>Jejunum</p> Signup and view all the answers

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