1. The Ear Histology doesn’t get better than this!

2. Anatomy of the Ear

3. Middle Ear

4. The Inner Ear Osseous Labyrinth

5. Bony Labyrinth Membranous Labyrinth The Inner Ear

6. Membranous in Osseous Labyrinth

7. Receptor Organs (red) in the Membranous Labyrinth

8. General Structure of a Receptor Organ

9. “Hairs” of a Hair Cell

10. A Macula

11. ~ 10 microns ~ 1 centimeter

12. Crista Ampulla Cupula

13. 123123 1Bone 2Osseous labyrinth 3Membranous labyrinth The cochlear duct is a long coiled tube in a long coiled hole in the bone. The organ of Corti is a long coiled ribbon 123123 Uncoiled

14. Membranous Labyrinth in Osseous Labyrinth

15. The Cochlea is coiled

17. The organ of Corti

18. The Organ of Corti is a Ribbon

19. Base | | Tip High Pitch Low Pitch High pitch is detected at the base of the cochlea because the basilar membrane is narrower there. Each sound frequency is detected at a specific position along the cochlea at which it resonates. Basilar membrane

20. Pathway of Sound through the Ear

22. Movement of Fluid in the Cochlea

23. Movements of the basilar membrane from sound

24. Base | | Tip High Pitch Low Pitch Basilar membrane

25. Swings with Different Lengths of Rope Will Vibrate At Different Frequencies…

26. The Organ of Corti

28. Two ways to make a swing go higher Pushing Pumping

29. The Extraordinary Outer Hair Cell

30. Ears make sound called otoacoustic emissions

31. Mechanical Receptors of the Hair Cell

32. Pathologies of Ears 1. Deafness 2. Vertigo 3. Tinnitus