1. Mechanoreception (the ear)

2. STRUCTURES OF THE EAR
Tympanum (ear drum)
Auditory canal

3. STRUCTURES OF THE EAR Outer Ear Consist of Pinna and auditory canal
Tympanum (ear drum)
Auditory canal

4. STRUCTURES OF THE EAR-Outer EAR
Pinna
Is the outside flap of the ear
Made of skin and cartilage
Shaped in a way that enhances sound vibrations
Focuses them into the ear
Tympanum (ear drum)
Auditory canal

5. STRUCTURES OF THE EAR-Outer EAR
Auditory Canal
Is a tube (2.5 cm long)
Leads to the eardrum-tympanum
Hairs & earwax secreted by glands

6. STRUCTURES OF THE EAR-Outer EAR
Auditory Canal
Hairs & earwax secreted by glands
Prevent
Dust
Insects
Bacteria
Other foreign materials
From proceeding deeper into the ear

7. STRUCTURES OF THE EAR-Outer EAR
Should you use swaps to clean out earwax?

8. STRUCTURES OF THE EAR-Middle EAR
Is an air-filled space that is bordered on one side by the tympanum (eardrum)
Tympanum (ear drum)
Auditory canal

9. STRUCTURES OF THE EAR-Middle EAR
EAR DRUM
Is an air-filled space that is bordered on one side by the tympanum (eardrum)
Tympanum (ear drum)
Auditory canal

10. STRUCTURES OF THE EAR-Middle EAR
EAR DRUM
Elastic structure that vibrates in response to sound waves
Tympanum=
Greek word for drum
Tympanum (ear drum)
Auditory canal

11. STRUCTURES OF THE EAR-Middle EAR
Ossicles
Three tiny, interconnected bones in the middle ear
Tympanum (ear drum)
Auditory canal

12. STRUCTURES OF THE EAR-Middle EAR
Ossicles
Each bone acts as a lever for the next
Small movement in one results in a larger movement in the next
Tympanum (ear drum)
Auditory canal

13. STRUCTURES OF THE EAR-Middle EAR
Stapes concentrates vibrations into
Oval window

14. STRUCTURES OF THE EAR-Middle EAR
Oval window
Membrane-covered opening
In the wall of the inner ear
Tympanum is
15-30X larger
Oval window
Amplify vibrations

15. STRUCTURES OF THE EAR-Middle EAR
Eustachian tube
Middle ear connected to throat by the eustachian tube
Read p. 420
What is the role of the eustachian tube?

16. STRUCTURES OF THE EAR-Inner EAR
Consist of three interconnecting structures
Semicircular canals
Vestibule
Cochlea

17. STRUCTURES OF THE EAR-Inner EAR
Semicircular canals
Vestibule
Cochlea