1. Surface ectoderm give rise to:

2. Maldevelopment of the first and second branchial arches may result in:

3. The tympanic membrane is derived from:

4. The external ear:

5. The major function of the middle ear is to:

6. Normal Eustachian tube function serves to:

7. Conductive hearing loss:

8. Amplification of sound through hearing aids:

9. In early otosclerosis in which there is increased stiffness of the oscicular chain at the stapediovestibular junction one would expect to find:

10. A 73 year old man notes right-sided nasal obstruction and a right-sided hearing loss. Physical examination reveals a malignant mass in the nasopharynx that occludes the Eustachian tube orifice. The hearing loss associated with this abnormality is due to:

11. A 12 year old boy has a large perforation of his right tympanic membrane due to repeated severe episodes of otitis media. The hearing loss associated with this abnormality is due to:

12. The membranous labyrinth:

13. The traveling wave that is set up on the basilar membrane in response to sound has the following behavior:

14. The physical property of the basilar membrane that provides a Òplace mechanismÓ for frequency analysis of sounds reaching the inner ear is:

15. Hair cells are:

16. Hair cells are functionally polarized which means that:

17. Perilymph:

18. The spiral ganglion of the inner ear contains

19. The Òvolley theoryÓ of hearing is based on the fact that:

20. A sensorineural hearing loss:

21. The adequate stimulus for exciting the receptor cells of the cristae is:

22. The adequate stimulus for activating the saccule and utricle and, in turn, their receptors is:

23. The differential sensitivity of inner ear receptors to sound vibration and linear and angular acceleration is due to:

24. The role of the vestibular labyrinth in the control of upright posture and adjustment of body position is achieved primarily through activation of:

25. Nystagmus is a manifestation of the powerful influence the vestibular organs have on:

26. Audiometric testing by air conduction and bone conduction using pure tones would normally provide information on the integrity of:

27. On an audiogram, a difference between the threshold curves for airborne sound and bone-conducted sound indicates:

28. Poor speech-discrimination test scores are indicative of:

29. Normal children will or should be saying their first meaningful words by approximately:

30. A child born with a severe hearing loss usually:

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