1. Tape in Notebook
5 mins
50: 12.3 Clinical Application Smell and Taste Disorders
54: Lab 31 Smell and Taste Lab
55: Hearing Case Study: No More Loud Music (Read/Highlight/Questions)
56: External Ear Picture (color-coded--- Functions)
56: Now Hear This: Don’t Remove Earwax (Read/Highlight/Questions)
58: Middle Ear Picture (color-coded---Functions)
60: All About Ear Infections (ONLY Highlight)
62: Inner Ear Picture (color-coded---Functions)

2. 12.5: Major Parts of the Inner Ear
Sponge: Set up Cornell Notes on pg. 63
Topic:
12.5: Major Parts of the Inner Ear
Essential Questions:
Picture Bubble Map of Inner Ear:
Cochlea
Semicircular canals
Osseous Labyrinth
Membranous Labyrinth
Vestibule
Vestibulocochlear Nerve
12.5: Major Parts of the Inner Ear
2.1 Atoms, Ions, and Molecules
QUIZ: On MONDAY
Labeling the parts of the external, middle, and inner ear
Extra Credit:
IB Art mall
Little Mermaid
Tonight 6pm
Sat 2pm

3. Inner Ear

4. Inner Ear

5. Inner Ear The Inner Ear is a complex system of labyrinths
Osseous (bony) labyrinth
rigid outer wall of inner ear
secretes perilymph which conducts sound vibrations
Membranous labyrinth
tube within osseous labyrinth
filled with endolymph which conducts sounds
Houses receptor cells for hearing and equilibrium

6. Inner Ear Three Parts of Labyrinths: Semicircular canals
1. Cochlea (coke/le/ah) or (Kok/le/ah)
functions in hearing
2. Semicircular canals
provides a sense of equilibrium
3. Vestibule
functions in equilibrium AND hearing
Semicircular canals
vestibule
cochlea

7. The Vestibulocochlear Nerve:
Aka acoustic or auditory nerve
Has two branches:
1. vestibular branch: senses changes in the position of the head to maintain equilibrium
2. cochlear branch: send signals to brain where sound can be interpreted

8. Pg. 62 Cochlea Organ of Corti Scala Vestibuli Scala Tympani
Leave a little room for info about cochlea
Organ of Corti
Scala
Vestibuli
Scala
Tympani
Cochlear Duct
Vestibular Membrane
Basilar Membrane

9. Cochlea Cochlea Functions in hearing Shaped like a snail
Coiled around a bony core (modiolus)

10. Cochlea Scala vestibuli upper compartment of cochlea
leads from oval window to apex of spiral
conducts sound vibrations to the scala media (cochlear duct)
contains perilymph
Oval window

11. Cochlea Scala tympani lower compartment
extends from apex of the cochlea to round window
allows the vibrations to escape into the air of the tympanic cavity
contains perilymph
Round window

12. Cochlea Scala Vestibuli Scala Tympani Vestibular membrane
separates cochlear duct from scala vestibuli
Separates endo/perilymph
Diffusion barrier- allows nutrients to travel from perilymph to endolymph
Cochlear duct aka scala media
lies between the scala vestibuli and scala tympani
Filled with endolymph
Houses the organ of Corti
Basilar membrane
separates cochlear duct from scala tympani
Floor of cochlear duct
Separates the endo/perilymph
endolymph
Scala Vestibuli
Scala Tympani

13. Organ of Corti ***Organ of Corti***:
Hair cells: hearing receptor cells located here
on upper surface of basilar membrane
Different frequencies of vibration move different parts of basilar membrane
Sound frequencies cause hairs of receptor cells to bend
Simulates the vestibulocochlear nerve which will send the signals to the brain for interpretation

14. Pg. 62 Label this diagram of the Ear *Quiz on Mon.
Tympanic Membrane Cochlea Incus Tympanic Cavity Auricle Stapes Round Window Malleus Auditory Tube Semicircular Canals Vestibulocochlear Nerve External Acoustic Meatus

15. Pg. 62 Label this diagram of the Ear *Quiz on Mon.
stapes
Incus
malleus
Semicircular canals
Auricle
Tympanic membrane
cochlea
Vestibulocochlear nerve
Round window
External acoustic meatus
Tympanic cavity
Auditory tube
Tympanic Membrane Cochlea Incus Tympanic Cavity Auricle Stapes Round Window Malleus Auditory Tube Semicircular Canals Vestibulocochlear Nerve External Acoustic Meatus

16. 12.5: How Sound Travels Through the Inner Ear
Sponge: Set up Cornell Notes on pg. 65
Topic:
12.5: How Sound Travels Through the Inner Ear
Essential Questions:
NONE.
12.5: How Sound Travels Through the Inner Ear
2.1 Atoms, Ions, and Molecules

17. Ear Labeling Quiz Time 15pts

18. The stapes vibrations enter the perilymph at the oval window
Travel along the scala vestibuli
Enter the endolymph of the cochlear duct
Move the basilar membrane
a. Causing the hair cells in the Organ of Corti to bend
b. Send signals along the vestibulocochlear nerve to the brain
Vibrations enter the perilymph of the scala tympani
Forces are dissipated into the air in the tympanic cavity
DON’T
WRITE

27. 1. Sound waves vibrate the tympanic membrane
2. The tympanic membrane vibrates the auditory ossicles
3. The vibrations enter the perilymph (fluid in the scala vestibule and scala tympani) at the oval window
4. Travel along the scala vestibule (top compartment of cochlea)
5. Enter the endolymph (fluid in the cochlear duct) of the cochlear duct
6. These vibrations move the basilar membrane
a. Frequencies cause organ of corti to bend against the tectorial membrane
b. Vesicles in hair cells release neurotransmitters
c. Neurotransmitters stimulates the ends of nearby sensory nerve fibers
d. Impulse travels along the cochlear branch of the vestibulocochlear nerve
e. To the medulla oblongata
f. Through the midbrain
g. To the thalamus
h. Into auditory cortices of the temporal lobes of the cerebrum (BRAIN) where they are interpreted
7. Vibrations enter the perilymph of the scala tympani
8. Forces are dissipated into the air in the tympanic cavity by movement of the round window

28. Inner Ear Animation Video

30. Cochlear Implant Implant placed under skin above the ear
Leads to electrodes placed near auditory nerve in the cochlea
Wear a head set that has a microphone to pick up incoming sounds
Sends electrical signals to cochlea
Auditory nerve is stimulated

31. Cochlear Implants 3m7s

32. 8 mo. Old Deaf Baby with Cochlear Implants 49s

33. Bionic Ears Start at (4m42s) 4m10s

34. Clinical Application 12.4: Getting a Cochlear Implant