Q:

The tympanic membrane (ear drum) contains tissue derived from the:

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The tympanic membrane (ear drum) contains tissue derived from the:


  1. mesenchyme of the first and second branchial arches
  2. ectoderm of the second branchial cleft (groove)
  3. endoderm of the second pharyngeal pouch
  4. both A and B
  5. all of the above (A-C)

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A. mesenchyme of the first and second branchial arches

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