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