L4 Devnt II - Neuraltissue 1....

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Neural tissue 1. Neural tube – some grow out to targets  e.g. motor neurones, some connect within  the tube 2. Neural crest 3. Neurogenic  placodes
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Head       very distinct from trunk and tail     mouth, gill slits      concentration of sense organs  (nose, eyes, ears), swollen nerve  cord = brain      brain protected in cranium
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2. Neural crest – invented when heads were invented
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Neural crest migration pathways To make: DRGs (sensory ns) sympathetic ganglia enteric ganglia adrenal medulla melanophores Schwann cells
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Neural crest in head makes: skull connective tissue tooth buds cranial ganglia hyoid, cricoid etc
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Skull bones in a  chicken derived from  neural crest
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3. Neurogenic placodes – also invented when heads were invented
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Area of thickened epithelium  gives rise to nerves.
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