Chapter 15 (4)
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What are hair cells?
Receptors of the inner ear.
Free surfaces of hair cells are covered by what?
- 80–100 stereocilia (like long microvilli)
- May contain single large kinocilium
Hair cells detect what kind of movement?
What are the three regions of the ear?
What is the function of the outer ear?
visible portion that collects and directs sound waves toward middle ear.
What are the components of the outer ear?
- External acoustic meatus (passageway in temporal bone)
What is the external acoustic meatus lined with?
- Ceruminous glands (secrete waxy cerumen)
What are the components of the middle ear?
- Tympanic membrane
- Auditory ossicles
- Auditory tube
What are the auditory ossicles and what are there locations and function?
- Bones that connect tympanic membrane to receptor complexes of inner ear (smallest bones and synovial joints of body)
- Malleus (attached at three points to tympanum)
- Incus (middle ossicle)
- Stapes (bound to oval window of cochlea)
What is the function of the auditory tube?
Connects middle ear to pharynx to equalize pressure on either side of tympanic membrane.
What is otitis media?
A bacterial infection of the auditory tube
What are the muscles of the middle ear and what are there functions?
- Tensor tympani muscle: Connects to malleus and can dampen tympanic membrane vibrations.
- Stapedius muscle (smallest muscle in body): Connects to stapes and reduces its movement at oval window.
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