TBL 16: Gut tube Flashcards
What is the primitive endoderm-lined gut tube formed by?
What surrounds the gut tube endoderm?
the primitive endoderm-lined gut tube is formed by incorporation of a portion of the yolk sac into the embryo during craniocaudal and lateral folding.
visceral mesoderm surrounds the gut tube endoderm; thus connective tissue and smooth muscle contributing to the tubular wall are derivatives of the visceral mesoderm
What constitutes the gut tube?
What becomes incorporated into the connecting stalk?
the cranial foregut, caudal hindgut, and midgut, which is open to the yolk sac via the vitelline duct, constitute the gut tube
the vitelline duct and most of the yolk sac become incorporated into the connecting stalk.
Where do the lung buds project from?
caudal end of pharyngeal portion of the foregut is where the lung bud projects from
What does the tracheoesophageal septum partition?
the tracheoesophageal septum partitions the pharyngeal and esophageal portions of the foregut from the lung bud.
What do the gall bladder, liver, and pancreas arise as?
the gall bladder, liver, and pancreas arise as endodermal buds from the proximal duodenum
What organs are foregut derivatives?
What do derivatives of the midgut and hindgut form?
the pharynx, esophagus, stomach, proximal duodenum, gallbladder, liver, and pancreas are foregut derivatives.
Derivatives of the midgut and hindgut form the rest of the digestive tract.
What do the celiac artery, superior mesenteric artery (SMA) and inferior mesenteric artery (IMA) supply?
the celiac artery, superior mesenteric artery (SMA) and inferior mesenteric artery (IMA) are unpaired branches of the abdominal aorta that supply the foregut, midgut and hindgut derivatives, respectively
What does the hepatic portal vein receive blood from?
the hepatic portal vein receives venous blood from the foregut, midgut and hindgut derivatives thus providing 80% of blood flow into the liver
