USMLE Embryo
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USMLE Embryo
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25 Questions

1. For what reason do hypospadias need to be fixed?

2. From what region do the thalami form?

3. By what week is the neural tube supposed to be closed? when did it start forming?

4. What embryologic structure provides the aorticpulmonary septum?

5. Weeks _______ erythropoiesis takes place in the liver

6. What secretes hCG?

7. What embryonic structure gives rise to the ascending aorta? what else does it give rise to?

8. From where does the medulla form?

9. In what chromosomal disorder is horseshoe kidney commonly seen? what poles of the kidneys fuse?

10. From What embryonic layer do chromaffin cells arise?

11. What causes a large posterior fossa in a dandy walker malformation? What is found in this fossa?

12. What causes the decrease in Right atrial pressure to close the fossa ovale?

13. which posterior fossa malformation results in aqueductal stenosis and hydrocephaly? what other spinal cord lesion does this malformation present with?

14. What is the effect of teratogens before week 3?

15. What causes a vesicourachal diverticulum? What is it?

16. From What embryonic layer is the vagina from? testes? ovaries?

17. What causes persistent Truncus Arteriosus? What does it result in?

18. What results in annular pancreas? How does it happen?

19. From What embryonic layer does the inner arise?

20. What is the defect in spina bifida occulta? is there any structural herniation? where on the spinal cord is it usually seen?

21. What are the three results of having pathology in the aorticopulmonary septum?

22. what muscles are derived from branchial arch 4? CN?

23. From What embryonic layer is the spleen from?

24. From What embryonic lare are the odontoblasts from?

25. What trisomy is associated with holoprosencephaly? What teratogen?

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