Re: Nervous System Development - Part 3

Comments:
: : : Nervous System Development T/F : : : 1. The events of neurulation result in the conversion of a bilaminar embryo to a trilaminar embryo. : : F - gastrulation? : Agree : : : 2. The notocord develops in the mesoderm and induces overlying endoderm to form the neural plate. : : F - overlying ectoderm? : Agree : : : 3. The first evidence of eye development appears after the fusion of the posterior (caudal) neuropore. : : F - the rostral neuropore? : Agree that it is false.....but the first evidence of the eye appears prior to the fusion of the anterior/cranial/rostral neuropore : : : 4. Congenital defects of the eye are often located in the superior portion of the globe. : : F - inferior : Agree : : : 5. The lens placode and neural crest cells give rise to the lens. : : T - from the lens placode at least. During lens formation, the neural crest cells migrate from the lens to the corneal epithelium. Does that count as "giving rise to"? : Neural crest cells do not contribute to lens formation. They do contribute to the inner layer of the cornea. : : : 6. The inner layer of the optic cup gives rise to the neural retina and the outer layer of the optic cup gives rise to the retinal pigmented epithelium. : : T : Agree : : : 7. Neural crest cells give rise to preganglionic sympathetic fibers, postganglionic parasympathetic fibers, and dorsal root ganglia. : : T? : False - neural crest cells do not give rise to preganglionic fibers (sympathetic or parasympathetic). They do give rise to all postganglionic fibers of the ANS, and to dorsal root ganglia. : : : 8. Ventral roots do not contain nerve fibers derived from neural crest cells. : : T? : Agree : : : 9. Neural crest cells migrate from distal to proximal portions of the gut tube. : : F - proximal to distal : Agree : : : 10. The mantle layer of the developing spinal cord becomes the myelinated region of the adult spinal cord. : : F - mantle layer becomes the grey matter, marginal layer becomes the myelinated (white) matter. : Agree

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