During embryonic development,the external ear develops from a structure called the first

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The external ear develops from the pharyngeal cleft, which is also known as the first branchial cleft. The pharyngeal cleft is a groove that forms on the surface of the embryo in the area of the future head and neck. As the embryo grows, this groove deepens and becomes separated from the surface ectoderm by a layer of mesenchyme. This mesenchyme then gives rise to the various structures of the ear, including the external ear. None of the other structures listed contribute to the development of the external ear.

During Embryonic Development,the External Ear Develops from a Structure Called