Acoustic meatus

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Acoustic Meatus

Acoustic meatus (pronunciation: /əˈkuːstɪk miːˈeɪtəs/), also known as the auditory meatus, is a term used in anatomy to refer to either the external or internal passages of the ear that transmit sound from the outer ear to the eardrum.

Etymology

The term "acoustic meatus" is derived from the Latin words "acusticus," meaning "pertaining to hearing," and "meatus," meaning "a passage or channel."

External Acoustic Meatus

The external acoustic meatus (EAM) is a tube running from the outer ear to the middle ear. The EAM is approximately 2.5 cm long in adults and is made up of cartilage and bone. It serves to protect the tympanic membrane (eardrum) and to amplify sound waves.

Internal Acoustic Meatus

The internal acoustic meatus (IAM) is a canal within the petrous part of the temporal bone of the skull. It transmits the facial and vestibulocochlear nerves from the inner ear to the brain.

Related Terms

  • Tympanic membrane: Also known as the eardrum, it is a thin membrane that separates the external ear from the middle ear. Its function is to transmit sound from the air to the ossicles inside the middle ear.
  • Temporal bone: A large bone at the base and side of the skull that houses the structures of the ear.
  • Vestibulocochlear nerve: The nerve responsible for transmitting sound and equilibrium information from the inner ear to the brain.

External links

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