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External auditory canal

Definition

noun

A canal of the auditory system between the auricle (pinna) and the tympanic membrane (eardrum).


Supplement

Tthe external auditory canal is sometimes referred to as simply auditory canal. It consists of cartilaginous and bony parts. It is about 2.5 cm in length and is lined with skin and tiny hairs. Cerumen is produced in the outer third of the cartilaginous portion of the canal to help prevent bacteria, fungi, insects and water from entering the ear. It is involved in transmitting sound waves.


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What is the function of the following tisues in the lungs?

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