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Which pharyngeal arch is associated with Treacher Collins syndrome?

waelhammad
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2022-11-10
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Which pharyngeal arch is associated with Treacher Collins syndrome?

  1. Pharyngeal arch 1
  2. Pharyngeal arch 2
  3. Pharyngeal arch 3
  4. Pharyngeal arch 4
  5. Pharyngeal arch 6
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waelhammad
2022-11-10
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A. First arch syndrome results from abnormal development of pharyngeal arch 1 due to a lack of migration of neural crest cells. Treacher Collins syndrome is associated with under-development of the zygomatic bone, down-slanting palpebral fissures, and deformed lower eyelids and external ears.

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