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10 Cards in this Set
- Front
- Back
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Induction
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ectoderm->neuro-ectoderm-> neural tube/crest
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proliferation
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neural epithelium-> neurons
-only the inner surface of epithelium has division |
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migration
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usually uses glial cell guides
-cortex cells migrate along radial glial fibers |
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differentiation
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neuroblast->neuron, may require epigenetic influence
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prenatal cell death
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competition for synapses, requiring trophic factors derived from targets
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neural plate
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derived from dorsal ectoderm during induction
-gives rise to neural tube |
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neural crest
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neural plate edge curls to dorsal surface
-migrates to become PNS |
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placodes
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at edge of cranial neural plate
-gives rise to ears, nose, cranial sensory ganglions |
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growth cone
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at axon terminus
-sensor of environmental signals (contact, chemo attraction/repulsion) |
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nerve growth-factor (NGF)
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trophic factor that causes a halo of axonal growth from the sensory neurons w/in a ganglion
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