1. Anatomy of the Ear
Parts of the Ear

2. Is this your ear?

3. NOPE – This is the Ear!

4. There are three sections of the ear!
OUTER
MIDDLE
INNER

5. Outer Ear Pinna -also known as the Auricle
Ear Canal or External Auditory Canal

6. Middle Ear Tympanic Membrane - Ear Drum Eustachian Tube
Three Bones known as the Ossicular Chain
Malleus
Incus
Stapes

7. Inner Ear Semicircular canals Cochlea Organ of Corti 3 Chambers
2 Membranes

10. Review

13. Anatomy of the Ear
Functions of the Ear

14. Outer Ear Pinna -also known as the Auricle. Ear Canal
Made entirely of cartilage
Varies in size and shape
Gathers sound waves from the environment
Ear Canal
Lined with hair follicles to keep foreign objects out
Lined with skin-supporting glands
Sebaceous- secretes an oily, fatty substance is cerumen (also known as ear wax)
Cerumen exits ear naturally

15. Middle Ear Tympanic Membrane - Ear Drum Eustachian Tube – Equalizer
Must be protected, extremely thin
Keeps constant temperature and humidity
Vibrates when sound waves hit it
Eustachian Tube – Equalizer
3 Primary Functions
Helps ventilate middle ear
Equalize pressure
Maintain proper drainage

16. Middle Ear - The Ossicular Chain
Malleus
Incus
Stapes
Purpose: helps transmit sound waves from the tympanic membrane to the inner ear

17. Look Again.

18. Inner Ear Cochlea 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

19. (from here it gets really complicated so we will stop)
Inside the Cochlea
“Organ of Corti –
Also Known As: Organ of Hearing”
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)

20. 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

21. Semicircular canals
The canals sit at right angles to each other, are all attached.
They detect horizontal and vertical movement as well as acceleration.

23. How the Ear Work!