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 does the ductus arteriosus shunt blood away from - to where? What is its remnant?






2. From what aortic arch does the common carotid artery arise? what else arises from this arch?






3. From What embryonic layer does connective tissue and muscle arise?






4. Which part of pancreas contribute to body? tail? isthmus? accessory pancreatic duct?






5. Gastroschisis is extrusion of abdominal contents out of abdominal folds ___________ by peritoneum






6. What is the prochordal plate?






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






8. What three layers form during gastrulation? From What do they form? and what week does gastrulation occur?






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






10. What congenital abnormality forms a 'double bubble' on xray?






11. From What embryonic layer do the parafollicular cells of the thyroid arise?






12. From What embryonic layer are the serous linings of the body cavities from? for ex - peritoneum?






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






14. What axis does the alar plate form? what neural system does it become?






15. What are the two walls of the prosencephalon and What do they become?






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






17. What are the clinical symptoms that present with syringomelia?






18. Monochorionic - ___________ twins are conjoined






19. From What embryonic layer is the eustachian tube from?






20. What weeks are considered the 'embryonic period'?






21. What is the effect of teratogens after week 8?






22. What does the midgut form? hindgut?






23. During what months is the fetus most susceptible to teratogens? What trimester?






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






25. Septum primum (patent foramen oval) caused by excessive resorption of...






26. What artery is derived branchial (aortic) arch 4?






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






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






29. From What embryonic layer do CNS neurons arise?






30. How do you differentiate a thyroglossal duct cyst from a persistent cervical sinus?






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






32. From What embryonic layer is the kidney and the adrenal cortex from?






33. What hormone is hcG structurally similar too?






34. From What embryonic layer does the gut tube epithelium arise?






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






36. From What embryonic layer do the astrocytes arise?






37. What are the two components of the placenta? From What do they form? which one secreted hcG?






38. What is germinal matrix hemorrhage associated with?






39. what invaginates to form the primitive streak?






40. What causes the degeneration of the spinal cord in syringomelia?






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






42. what closes the interventricular foramen?






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






44. Which branchial derivative creates the middle ear cavity - eustachian tube and mastoid air cells?






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






46. What embryologic structure provides the aorticpulmonary septum?






47. What hormones are in charge of external genitalia development in the fetus? (in both male and female)






48. What is the primitive streak? From what layer does it form?






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






50. From what region does the cerebral hemisphere form?