1. The Ear Perry C. Hanavan

2. Outer Ear Peripheral –Outer ear –Middle ear –Inner ear –Auditory nerve Central –Brainstem –Midbrain –Cerebral

3. Peripheral

4. Outer Ear - Pinna

5. Middle Ear - Tympanum

6. Middle Ear – Tympanic Membrane

7. Middle Ear – Ossicles

8. Middle Ear - Ossicles

9. Middle Ear – Ossicles - Malleus

10. Middle Ear – Ossicles - Incus

11. Middle Ear – Ossicles - Stapes

12. Middle Ear

13. Inner Ear - Osseous

14. Inner Ear - Membranous

15. Inner Ear - Labyrinth

16. Inner Ear – Organ of Corti

17. Cochlear Structures

18. Inner Ear – Organ of Corti

19. Basilar Membrane Traveling wave

20. Inner Ear – OHC & IHC IHC –Non-motile –Afferent –Responds to loud sounds OHC –Motile –Efferent –Responds to soft sounds

21. OHCs

22. Two Theories of Motility Somatic prestin motor Hair bundle motor

23. Tip-links –Hair Bundle Motor <<<IHC OHC >>>

24. Tip Link Structure

25. Hair Bundle Motor

26. Tip-links

27. Auditory Nerve

28. 2 Types of Auditory Neurons Paul Fuchs Paul Fuchs YouTube Paul Fuchs Paul Fuchs YouTube Type I Type II

29. The wave V latency used in the standard ABR IT5 and I-V delay measures is dominated by neural activity from the high-frequency regions of the cochlea. Thus, unless the tumor affects these high-frequency fibers sufficiently, standard ABR latencies will be normal. Large Tumor Abnormal Standard ABR Small Tumor Abnormal Standard ABR Small Tumor Normal Standard ABR Standard ABR