*400 Embryology Of The Nervous System* How many can you answer correctly ? *Send us your preferred topic to work on, tell us the type of questions you need, and we will get it done.* Join here: https://chat.whatsapp.com/FNGzlrYduf65yXdRcs8ZR4 1. The nervous system begins to develop during A. Week 2 B. Week 3 C. Week 4 D. Week 5 Answer: B 2. The first indication of nervous system development is the A. Formation of the neural tube B. Appearance of the neural crest C. Formation of the notochord D. Thickening of the ectoderm to form neural plate Answer: D 3. The neural plate forms from the A. Mesoderm B. Ectoderm C. Endoderm D. Notochord Answer: B 4. The notochord induces the overlying ectoderm to become A. Neural crest B. Neural groove C. Neural plate D. Somites Answer: C 5. The neural plate begins to form at the A. Cranial end B. Caudal end C. Midline D. Lateral margin Answer: A 6. The lateral edges of the neural plate elevate to form the A. Neural crest B. Neural folds C. Neural tube D. Neural groove Answer: B 7. The depression formed between the neural folds is called the A. Neural crest B. Neural canal C. Neural groove D. Central canal Answer: C 8. Fusion of the neural folds begins in the A. Cranial region B. Cervical region C. Caudal region D. Lumbar region Answer: B 9. The neural tube forms by the A. Regression of the primitive streak B. Folding and fusion of the neural folds C. Migration of mesoderm D. Proliferation of neuroepithelium Answer: B 10. The open ends of the neural tube are known as A. Anterior and posterior grooves B. Cranial and caudal fissures C. Rostral and caudal neuropores D. Brain and spinal cord openings Answer: C 11. The neural tube closes first in the A. Cervical region B. Cranial region C. Caudal region D. Thoracic region Answer: A 12. The rostral neuropore closes on day A. 23 B. 25 C. 27 D. 28 Answer: B 13. Failure of rostral neuropore to close results in A. Spina bifida B. Hydrocephalus C. Anencephaly D. Encephalocele Answer: C 14. The caudal neuropore closes on day A. 23 B. 25 C. 27 D. 28 Answer: D 15. Failure of caudal neuropore to close causes A. Encephalocele B. Meningoencephalocele C. Spina bifida D. Anencephaly Answer: C 16. Neural crest cells arise from A. Lateral plate mesoderm B. Ectoderm at the tip of neural folds C. Endodermal thickening D. Neural groove floor Answer: B 17. Neural crest cells give rise to all of the following except A. Dorsal root ganglia B. Adrenal medulla C. Melanocytes D. Motor neurons Answer: D 18. The spinal cord develops from the A. Caudal neural crest B. Ectoderm C. Neural tube caudal to the fourth pair of somites D. Midline mesoderm Answer: C 19. The wall of the neural tube consists of A. Pseudostratified columnar epithelium B. Stratified squamous epithelium C. Simple cuboidal epithelium D. Ciliated columnar epithelium Answer: A 20. Neuroepithelial cells differentiate into A. Neuroblasts and glioblasts B. Ganglion cells only C. Astrocytes only D. Ependymal cells only Answer: A 21. Neuroblasts are precursor cells that give rise to A. Astrocytes B. Microglia C. Neurons D. Oligodendrocytes Answer: C 22. The first cells to differentiate from neuroepithelial cells are A. Glioblasts B. Microglia C. Ependymal cells D. Neuroblasts Answer: D 23. Neuroblasts lose their ability to divide and migrate to form the A. Mantle layer B. Marginal layer C. Ependymal layer D. Neural crest Answer: A 24. The mantle layer eventually forms the A. White matter B. Grey matter C. Choroid plexus D. Ventricular system Answer: B 25. The marginal layer of the neural tube forms the A. White matter B. Grey matter C. Central canal D. Choroid plexus Answer: A 26. The mantle layer thickens to form two regions known as A. Roof and floor plates B. Basal and alar plates C. Dorsal and ventral plates D. Lateral and medial plates Answer: B 27. The alar plate is primarily associated with A. Motor function B. Sensory function C. Autonomic function D. Cognitive function Answer: B 28. The basal plate gives rise to A. Sensory neurons B. Autonomic neurons only C. Motor neurons D. Schwann cells Answer: C 29. The dorsal part of the spinal cord is formed by the A. Alar plate B. Basal plate C. Roof plate D. Floor plate Answer: A 30. The ventral part of the spinal cord is formed by the A. Roof plate B. Basal plate C. Alar plate D. Neural crest Answer: B 31. The sulcus limitans separates A. Left and right halves of the neural tube B. Cranial and caudal ends C. Alar and basal plates D. Neural crest and neuroepithelium Answer: C 32. Glioblasts differentiate into A. Neurons B. Astrocytes and oligodendrocytes C. Microglia and neurons D. Schwann cells Answer: B 33. Microglia are derived from A. Ectoderm B. Mesoderm C. Endoderm D. Neural crest Answer: B 34. The ependymal layer of the neural tube forms the A. Choroid plexus B. Lining of the central canal C. Blood-brain barrier D. Basal lamina Answer: B 35. Spinal nerves are formed from A. Basal and alar plates B. Dorsal and ventral roots C. Roof and floor plates D. Central canal outgrowth Answer: B 36. Ventral roots of spinal nerves originate from A. Neural crest cells B. Basal plate C. Alar plate D. Roof plate Answer: B 37. Dorsal roots of spinal nerves arise from A. Alar plate B. Basal plate C. Roof plate D. Neural crest cells Answer: D 38. The spinal cord initially occupies the entire length of the vertebral canal until A. Week 4 B. Week 8 C. Month 3 D. Month 5 Answer: C 39. By birth, the spinal cord ends at the level of A. L1-L2 B. T12 C. L4 D. L5 Answer: A 40. The filum terminale is derived from the A. Neural crest B. Terminal part of the spinal cord C. Ependymal cells D. Ventral horn Answer: B