Most posterior branchial arches (BAs) which primarily give rise to aortic arteries, neck muscles and cartilage structures.
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The neural crest in branchial arches 3, and 4 induce the endoderm to from the parathyroid and thymus (from the endoderm in the third pharyngeal pouch).
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Multiple AncestorsSingle AncestorNo DescendantsDevelops fromPart of Parent