Which pharyngeal cleft forms the external auditory meatus?

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Study for the Pharyngeal Apparatus Test. Dive into multiple choice questions with detailed explanations and hints. Prepare effectively for your exam!

Multiple Choice

Which pharyngeal cleft forms the external auditory meatus?

Explanation:
The external auditory meatus comes from the first pharyngeal cleft. During development, the groove between the first and second arches deepens and then canalizes to become the ear canal, with the tympanic membrane forming at the boundary between this cleft and the first pharyngeal pouch. The other clefts are largely obliterated (or contribute to neck structures, not the ear canal), so they do not form the external auditory meatus.

The external auditory meatus comes from the first pharyngeal cleft. During development, the groove between the first and second arches deepens and then canalizes to become the ear canal, with the tympanic membrane forming at the boundary between this cleft and the first pharyngeal pouch. The other clefts are largely obliterated (or contribute to neck structures, not the ear canal), so they do not form the external auditory meatus.

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