bony external auditory canal

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The Bony External Auditory Canal
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The Bony External Auditory Canal

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The medial bony external auditory canal is covered with a thin skin which contains no adnexal structures. The bony external auditory canal is surrounded by tympanic bone.

External Auditory Canal Junction [the Isthmus]
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External Auditory Canal Junction [the Isthmus]

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The junction between the cartilaginous lateral portion of the external auditory canal and the bony medial portion is referred to as the Isthmus.