Transcript EAR AND HEARING

EAR AND HEARING
1. PINNA-outer part of ear
5. EAR CANAL
6. EARDRUM-vibrates when sound hits it
2-4. HAMMER, ANVIL AND STIRRUP-vibrate when eardrum does
7. Eustachian tube-connects middle ear to throat to equalize pressure
8. OVAL WINDOW
9. AUDITORY NERVE-brings message to brain
10. COCHLEA-converts vibrations to nerve impulses with little hairs
11. ROUND WINDOW-”release” for pressure
12. SEMICIRCULAR CANALS-used for sense of balance
COCHLEA
• Spiral shaped organ
attached to
semicircular canals
• Semicircular canals
are used in sense of
equilibrium
Organ of Corti
• Runs the length of the
cochlea
• hair cells are vibrated
by fluid waves
• Vibration of hair cells
depolarizes them and
message travels down
auditory nerve.