PMS| Lecture 48 and 49
PMS| Lecture 48 and 49
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1. Closure of the cranial neuropore occurs at approximately day 25.
2. Closure of the caudal neuropore occurs at approximately day 25.
3. The fusion of the neural folds begins in the lumbar region.
4. The Nervous system is derived from the Ectoderm.
5. Neurulation is the process during which the neural tube begins to form.
6. Neural folds form during the 3rd week of development and are induced to form by the underlying notochord, joining to form a tube that gives rise to the brain and spinal cord.
7. The cephalic and caudal ends of the neural tube communicate with the amniotic cavity by way of the cranial and caudal neuropores, respectively.
8. Organogenesis occurs during the third to eighth weeks.
9. The neural tube is derived from the ectoderm.
10. Closure of the cranial neuropore occurs at day 25.
11. Spina bifida occurs due to failure of closure of the caudal neuropore.
12. The major features of the external body form are recognizable at the end of the second month.
Previous Exam Questions (47 questions)
1. Neural crest cells differentiate into neurons and glia, contribute to components of the heart and adrenal gland, form the pigmented melanocytes of the skin, and differentiate into skeletal and connective tissue of the head, but not the skeletal and connective tissue of the trunk.
2. Spina bifida cystica, a neural tube defect presenting as a large cystic swelling in the lower back, is caused by failure of closure of the caudal neuropore.
3. The most sensitive period for inducing birth defects is from the third week until the eighth week of gestation.
4. The nasal mucosa, nervous tissue, and adrenal medulla are derived from ectoderm, while the adrenal cortex is derived from mesoderm.
5. The neural tube forms the brain from its cranial broad part and forms the spinal cord from its caudal narrower part.
6. Closure of the cranial neuropore occurs at approximately day 25 of development.
7. The major features of the external body form are recognizable at the end of the second month of development.
8. Neural folds are induced to form by the underlying notochord, join to form a tube that gives rise to the brain and spinal cord, and form during the 3rd week of development.
9. The nervous system is derived from the ectoderm.
10. Failure of closure of the neural tube in the cranial region is called anencephaly.
11. The cephalic and caudal ends of the neural tube communicate with the amniotic cavity via the cranial and caudal neuropores, respectively.
12. The embryonic period occurs from the 3rd to the 8th week of development.
13. Spina bifida is an anomaly due to posterior neuropore closure failure.
14. Three derivatives of neural crest cells are cranial nerve ganglia, odontoblasts, and leptomeninges.
15. The major features of the external body form are recognizable at the end of the second month.
16. Closure of the cranial neuropore occurs at approximately day 25, whereas the posterior neuropore closes at day 28.
17. Neural crest cells originate from the neuroectoderm and give rise to derivatives such as pseudounipolar ganglion cells of the spinal and cranial nerve ganglia, Schwann cells, multipolar ganglion cells of the autonomic ganglia, leptomeninges, chromaffin cells of the suprarenal medulla, pigment cells, odontoblasts, and skeletal and connective components of the pharyngeal arches.
18. Neurulation is the process of formation of the neural tube, and two derivatives of the ectodermal germ layer are the central nervous system (brain and spinal cord) and the peripheral nervous system.
19. Neural crest cells differentiate into neurons and glia.
20. Neural crest cells differentiate into skeletal and connective tissue of the head.
21. Neural crest cells contribute to components of the heart and adrenal gland.
22. Neural crest cells form the pigmented melanocytes of the skin.
23. Spina bifida cystica, a neural tube defect, can be explained by the failure of closure of the caudal neuropore.
24. The most sensitive period for inducing birth defects is from the third week until the eighth week of gestation.
25. The nasal mucosa is derived from ectoderm.
26. Nervous tissue is derived from ectoderm.
27. The adrenal medulla is derived from ectoderm.
28. The neural tube forms the brain from its cranial broad part and forms the spinal cord from its caudal narrower part.
29. Closure of the cranial neuropore occurs at day 25.
30. The major features of the external body form are recognizable at the end of the second month.
31. Neural folds are induced to form by the underlying notochord.
32. Neural folds join to form a tube that gives rise to the brain and spinal cord.
33. Neural folds form during the 3rd week of development.
34. The nervous system is derived from ectoderm.
35. Failure of closure of the neural tube in the cranial region is called anencephaly.
36. The cephalic and caudal ends of the neural tube communicate with the amniotic cavity.
37. The embryonic period occurs from the 3rd to the 8th week of development.
38. The cephalic and caudal ends of the neural tube communicate with the amniotic cavity in a way of the cranial and caudal neuropores respectively.
39. Spina bifida is an anomaly due to posterior neuropore closure failure.
40. Three derivatives of neural crest cells are cranial nerve ganglia, odontoblasts, and leptomeninges.
41. Closure of the cranial neuropore occurs at approximately day 25, whereas the posterior neuropore closes at day 28.
42. Neural crest cells originate from the neuroectoderm.
43. Derivatives of neural crest cells include pseudounipolar ganglion cells of the spinal and cranial nerve ganglia, Schwann cells, multipolar ganglion cells of the autonomic ganglia, leptomeninges, chromaffin cells of the suprarenal medulla, pigment cells, odontoblasts, and skeletal and connective components of the pharyngeal arches.
44. Neurulation is the process of formation of the neural tube.
45. Two derivatives of the ectodermal germ layer are the central nervous system (brain and spinal cord) and the peripheral nervous system.
46. Two derivatives of the ectodermal germ layer are the central nervous system (brain and spinal cord) and the sensory epithelium of the ear, nose, and eye.
47. Two derivatives of the ectodermal germ layer are the central nervous system (brain and spinal cord) and the epidermis, including the hair and nails.
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PMSLecture48and49
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Okay, look man, let me explain this whole embryonic development thing to you. This is really important for understanding how things can go wrong and cause birth defects, so pay attention! **The Embryonic Period: Organogenesis** The **embryonic period**, also known as the **period of organogenesis*...
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What are the primary objectives when studying the embryonic...
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