External acoustic meatus

Definition

noun

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


Supplement

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


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