Download Anatomy of the Ear

Anatomy of the Ear
Parts of the Ear
Is this your ear?
NOPE – This is the Ear!
There are three sections of the ear!
 OUTER
 MIDDLE
 INNER
Outer Ear
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Pinna -also known as the Auricle
Ear Canal or External Auditory Canal
Middle Ear
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Tympanic Membrane - Ear Drum
Eustachian Tube
Three Bones known as the Ossicular Chain
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Malleus
Incus
Stapes
Inner Ear
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Semicircular canals
Cochlea
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Organ of Corti
3 Chambers
2 Membranes
Review
Anatomy of the Ear
Functions of the Ear
Outer Ear
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Pinna -also known as the Auricle.
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Made entirely of cartilage
Varies in size and shape
Gathers sound waves from the environment
Ear Canal
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Lined with hair follicles to keep foreign objects out
Lined with skin-supporting glands
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Sebaceous- secretes an oily, fatty substance is cerumen
(also known as ear wax)
Cerumen exits ear naturally
Middle Ear
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Tympanic Membrane - Ear Drum
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Must be protected, extremely thin
Keeps constant temperature and humidity
Vibrates when sound waves hit it
Eustachian Tube – Equalizer
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3 Primary Functions
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Helps ventilate middle ear
Equalize pressure
Maintain proper drainage
Middle Ear - The Ossicular Chain
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Malleus
Incus
Stapes
Purpose: helps transmit sound waves from the
tympanic membrane to the inner ear
Look Again.
Inner Ear
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Cochlea
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Twisting bony shell
Diagrams show the inside
3 to 5 rows of thousands of tiny hairs
Three Scala (or chambers)
 Scala Vestibuli - oval window
 Scala Media (cochlear duct)
 Scala Tympani - round window
Inside the Cochlea
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“Organ of Corti –
Also Known As: Organ of Hearing”
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full length of Scala Media
resides on basilar membrane
lined with nerve endings
come together to make 8th nerve
(from here it gets really
complicated so we will stop)
Inside the Cochlea
Each chamber had different fluids that cannot mix –
if these fluids cannot mix - will kill all nerves.
 These fluids separated
by membranes
– Reissner’s Membrane
– Basilar Membrane
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Semicircular canals
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The canals sit at right angles to each other, are all
attached.
They detect horizontal and vertical movement as
well as acceleration.
How the Ear Work!
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https://www.youtube.com/watch?v=qgdqpoPb1Q