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. Only _______________________________ are associated with neural tube defects






2. What axis does the basal plate form? what neural system does it become?






3. Which branchial derivative accounts for the posterior 2/3 of the tongue?






4. What is the initial step to interventricular septum development? is it complete?






5. From What embryonic layer is the spleen from?






6. What is the homeobox gene responsible in developing? (What axis)






7. Which branchial apparatus develops into the inferior parathyroids?






8. What type of - amnios does bilateral agenesis form? What three symptoms does this cause?






9. What gene is produced in the zone of polarizing activity?






10. Which cranial nerve innervates the motor function of the tongue?






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






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






13. What is holoprosencephaly? what eye disorder does it result in?






14. what closes the ductus arteriousus?






15. What connects the thyroid to the tongue? when happens if it doesnt obliterate?






16. What hormone is hcG structurally similar too?






17. Where is the apical ectodermal ridge?






18. What type of radiation is teratogenic ?






19. From What embryonic layer do the astrocytes arise?






20. what else is the caudal regression known as? What two teratogen can cause this in the fetus?






21. What is duodenal atresia usually due to? What trisomy is it most often seen in?






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






23. What is another name for the mesonephric duct? paramesonephric?






24. Where does the blastocyst implant in the uterus? During what phase of the menstrual cycle?






25. What does the mullerian duct develop into? wollffian?






26. From What embryonic layer does the retina arise?






27. what muscles are derived from branchial arch 2?






28. Where is sonic hedgehog gene produced? What axis is it responsible in patterning?






29. What produces testis determining factor? what cells are produced from this? and What do they secrete? does this result in?






30. Which is more common - epispadias or hypospadias?






31. What artery is derived branchial (aortic) arch 1?






32. What components do the neural crest cells of the branchial arches give rise to?






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






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






35. What does the first cleft/groove of the branchial apparatus develop into?






36. What type of blood do umbilical veins carry? From where to where?






37. what structures are the derivatives of the neural crest cells in branchial arches?






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






39. What embryologic structure provides the aorticpulmonary septum?






40. On what side is the abnormal opening in epispadias? What causes it?






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






42. What is hypoplasia? is primordial tissue present?






43. What teratogen can cause an absence of digits amongst other things in the fetus? give an example.






44. What is the female remnant of processus vaginalis? male remnant?






45. What are the three regions of the brain (in order of cranial to caudal)?






46. Which CN allows for taste and sensation in the posterior 1/3 of the tongue? how about the very back ?






47. What does the ductus venosus shunt blood away from? What is its remnant?






48. When does erythropoeisis begin in the bone marow?






49. What day is the amnion formed?






50. What causes meconium discharge from the umbilicus?