Test your basic knowledge |

USMLE Embryo

Subjects : health-sciences, usmle
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. What is the notochord? What does the notochord later become?






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






3. what week do the genitalia start to have male/female characteristics? What trimester is that?






4. What arises from the fourth aortic arch?






5. What is used to keep the PDA open?






6. Does deformation occur during or after the embryonic period? is it due to an extrinsic or intrinsic disruption?






7. When is most important to take folic acid to prevent neural tube defects?






8. What separated myometrium of the uterus from the blastocyst?






9. Which branchial derivative creates the epithelial lining of the palatine tonsils?






10. what chemo drugs can cause neural tube defects in the fetus?






11. Where is the decidua basalis derived from?






12. What is the female remnant of the gubernaculum? male remnant?






13. When does hcG get secreted? What does it do?up until when ?






14. Which branchial arch derivative is obliterated?






15. failure to close of what fold results in sternal defects? omphalocele? gastrochisis? bladder extrosphy?






16. From What embryonic layer does the spinal cord arise?






17. What embryologic structure gives rise to the smooth outflow tracts of the ventricles? what else does it give rise to?






18. In anencephaly you see...






19. From where do the three different kidneys come from? Which is the earliest one? is it located most cranially or caudally?






20. Cleft palate is a failure of formation of the...






21. What do the groove/clefts of the branchial apparatus correlate to?






22. From which myotomes are muscles of the tongue derived from?






23. From What embryonic layer does the adenohypophysis arise?






24. The spinal cord is made from...






25. What do the arches of the branchial apparatus correlate to?






26. What day is the chorion formed?






27. From What embryonic layer does the parathyroid arise ?






28. What do membranous interventricular septal defect cause? What does this lead to?






29. what separates the atria from the ventricles?






30. What is the leading cause of birth defects in the US? what else is this perpetrator the leading cause of?






31. Other than not having a brain - what else is a symptom of anencephaly? why? hint: think about amniotic fluid






32. What does the ureteric bud interact with and What does it induce it to become?






33. What does DHT turn the urogenital sinus into? estrogen?






34. From what aortic arch does the first part of the maxillary artery arise?






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






36. When does the blastocyst split into two disks? What is this disk called? What are the two germ layers called?






37. which tracts are damaged first in syringomelia? What tract is preserved?






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






39. From where is amniotic fluid produced? other than electrolytes and carbs - what else does it contain?






40. From What embryonic layer does the lens of the eye arise?






41. What is the kidney that functions at the interim kidney in the 1st trimester? What does it later contribute to?






42. Which is more common - epispadias or hypospadias?






43. From where does the medulla form?






44. What is the 'fetal period'- ie When is it?






45. What hormone is hcG structurally similar too?






46. What does the first branchial pouch create?






47. From what aortic arch does the stapedial artery arise? the hyoid?






48. what happens in hydrocele?






49. what closes the interventricular foramen?






50. What is contained in the umbilical cord?