Embryology Practice Questions With Answers Study Guide Questions And Correct Answers

40. The derivatives of the embryonic ventral mesentery include the following structures EXCEPT: A. hepatoduodenal ligament B. hepatogastric ligament C. falciform ligament D. ligamentum teres hepatis E. lesser omentum {Ans: D. is correct. The ligamentum teres hepatis is a remnant of the fetal umbilical vein. Although it is contained within the ventral mesentery, it is not a derivative of it.}13. The first two intraembryonic germ layers to differentiate are the: A. ectoderm and hypoblast B. epiblast and hypoblast C. ectoderm and endoderm D. ectoderm and mesoderm {Ans: B. is correct. The epiblast and hypoblast develop from the inner cell mass during the 2nd week. During the 3rd week, the epiblast produces cells between itself and the hypoblast, called the mesoderm. Epiblast also replaces the hypoblast with endoderm cells. Epiblast then changes its name to ectoderm, completing the process of gastrulation.}26. When the amount of amniotic fluid exceeds two liters, the condition is called: A. oligohydramnios B. polyhydramnios or hydramnios C. amniotitis D. bag of waters E. hydrogravida {Ans: B. is correct. Polyhydramnios is a condition of excess amniotic fluid exceeding 1.5 liters. It is often caused by failure of the fetus to drink the normal amount of