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External auditory meatus lined by
ceruminous glands: secrete wax
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Roof of tympanic cavity
Plate of bone - separates from middle cranial fossa, meninges, temporal lobe of brain
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Floor of tympanic cavity
Thin plate of bone - separates from jugular fossa and carotid canal
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Lateral wall of tympanic cavity
Tympanic membrane - placed obliquely downwards and medially
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Base of stapes attached to
Oval window/fenestra vestibuli
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Muscle attached to malleus, and nerve supply
- Tensor tympani
- Mandibular nerve
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Muscle attached to stapes, and nerve supply
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Auditory tube leads to? and another name
- nasopharynx
- Eustacian tube
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Role of auditory tube
Allows air to enter or escape to equalise pressure
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Tympanic cavity communicates with ? posteriorly?
and via?
To mastoid antrum, via the aditus
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Mastoid antrum related to?
- Superiorly: temporal lobe
- Also separated by a thin plate of bone from posterior cranial fossa with cerebellum and sigmoid sinus
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Blood supply to middle ear
- Internal carotid artery
- Maxillary artery
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Middle ear innervated by? which plexus?
- Glosspharyngeal nerve
- Tympanic plexus
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Nerve running through middle ear?
Facial nerve, in bony canal
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Internal ear consists of? containing?
- Osseous labyrinth, containing membranous labyrinth
- Vestibule
- Semicircular canals
- Cochlea
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In vestibule? responsible for?
- Utricle, saccule
- Responsible for static equilibrium
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In semicircular canals? responsible for?
- Semicircular ducts
- Responsible for dynamic equilibrium
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What is the organ of hearing?
The cochlea duct
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Nerve supply to internal ear structures?
Vestibulocochlear nerve
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