BGD Practical - Gastrointestinal Quiz

From Embryology
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Here are a few simple questions that relate to your BGD practical, this page is not a part of today's Practical class.

  • You should try in your own time as self-directed learning after completing the Practical today.
  • If you get some wrong, read the displayed information with the answer, and try working again through the Lecture and Practical.
  • If you like this form of self-directed learning, please let me know by email and I will develop some more questions for you.
  • I am currently developing some more GIT Questions for 2016, come back after the practical classes have finished.
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See also the 1 Minute Embryology introduction to GIT.

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1. During week 3 which of the following early embryonic structures is/are established by gastrulation:

the coelomic space
the epiblast and hypoblast layers
the endoderm and mesoderm layers
the connecting stalk.
Gastrulation is the migration of epiblast cells through the primitive streak to form the endoderm and then the mesoderm layers of the trilaminar embryo. The coelomic space forms later within the lateral plate mesoderm forming the major body cavities. The epiblast and hypoblast layers form the bilaminar embryo during week 2 of development. The connecting stalk is extraembryonic mesoderm, forming the connection between the embryonic disc and the chorionic wall.

2. During embryonic disc folding in week 3 only the ectoderm layer folds ventrally left, right and above and below the notochord.

true
false
During folding in the third week all three germ cell layers (ectoderm, mesoderm and endoderm) fold together ventrally as described.

3. The intraembryonic coelom is a horse-shoe shaped cavity that develops in the lateral plate mesoderm from a series of smaller cavities fusing. Which of the following descriptions best describes the structure that then forms in this region.

somatic mesoderm close to ectoderm, the intraembryonic coelom and the splanchnic mesoderm closest to the endoderm.
somitic mesoderm close to ectoderm, the intraembryonic coelom and the splanchnic mesoderm closest to the endoderm.
somatic mesoderm close to endoderm, the intraembryonic coelom and the splanchnic mesoderm closest to the ectoderm.
somitic mesoderm close to endoderm, the intraembryonic coelom and the splanchnic mesoderm closest to the ectoderm.
intermediate mesoderm medially close to somites and laterally close to the intraembryonic coelom.
none of the above.
Yes trying to fool you with somatic (lateral plate) and somitic (paraxial) terms and the arrangement with germ cell layers. Remember that endoderm forms the gut epithelium and therefore splanchnic mesoderm which forms the associated connective tissue should be closer. The description of intermediate mesoderm relative anatomical location is correct, but it is not part of lateral plate separated by the intraembryonic coelom.

4. The intraembryonic coelom finally forms

the pericardial, pleural and periotoneal cavities.
a single percardial cavity and two pleural and two peritoneal cavities.
the neural tube lumen, gastrointestinal tract lumen and neural crest.
the cavities of the paired dorsal aortas running the length of the embryo.
The intraembryonic coelom finally forms the "3 P's" (pericardial, pleural and peritoneal). There is only one peritoneal cavity formed by the folding of the embryonic disc and fusion of the separate left and right spaces. These other anatomical spaces have noting to do with intraembryonic coelom. The dorsal aortas actually form within the splanchnic mesoderm.

5. The liver is formed from which of the following embryonic structures.

the septum transversum
the vitelline veins.
the placental veins.
the gastrointestinal endoderm.
all of the above.
The liver has multiple embryonic origins and all the listed components will contribute to liver development.

6. The following gastrointestinal tract structures undergo developmental rotation except:

stomach
duodenum
ventral pancreas
midgut
hindgut
Most of the gastrointestinal tract undergoes some form of mechanical rotation during development except the hindgut that forms initially from the cloacal space.

7. The caudal part of the midgut loop forms many intestine structures except:

distal ileum
vitelline duct
cecum
ascending colon
proximal part of transverse colon
The caudal (lower or distal) part does not form the vitelline duct (yolk stalk, omphalomesenteric duct), that extends from the flexure point of the midgut loop, forms a transient connection to the yolk sac, that is lost later in development.

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Cite this page: Hill, M.A. 2017 Embryology BGD Practical - Gastrointestinal Quiz. Retrieved September 20, 2017, from https://embryology.med.unsw.edu.au/embryology/index.php/BGD_Practical_-_Gastrointestinal_Quiz

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© Dr Mark Hill 2017, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G