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Hearing and Equilibrium

Hearing and Equilibrium. Special Senses Addendum. The Ear. Is divided into 3 anatomical regions External ear External auditory meatus to tympanic membrane. The Ear. Ceruminous glands secrete cerumen – ear wax. The Ear. Middle Ear Medial to tympanic membrane

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Hearing and Equilibrium

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  1. Hearing and Equilibrium Special Senses Addendum

  2. The Ear • Is divided into 3 anatomical regions • External ear • External auditory meatus to tympanic membrane

  3. The Ear Ceruminous glands secrete cerumen – ear wax

  4. The Ear • Middle Ear • Medial to tympanic membrane • Contains 3 auditory ossicles • Auditory tube connects middle ear to pharynx

  5. Middle Ear

  6. Auditory Ossicles Base of stapes fills the oval window 20X amplification Malleus Incus Stapes Air movement

  7. The Ear • Inner Ear • Consists of hollow bony structures filled w/ fluid -- endolymph • Contains the organs of: • Equilibrium – semicircular canals • Hearing -- cochlea

  8. The Inner Ear

  9. The Inner Ear

  10. Semicircular Canals • Three • Detect motion in three planes: • Yes • No • Tilting head from side to side

  11. Semicircular Canals • Hollow bony tubes • Filled with endolymph • Inside lined with hair cells – specialized neurons • Axons, in part, form VIII • Otoliths float across hair cells when head is in motion.

  12. Hair Cells

  13. Hair Cells

  14. Otoliths Activate hair cells

  15. Cochlea • Spiral shaped • Hollow bony, filled with endolymph • Lined by hair cells • Organ of Corti consists of: • Hair cells • Tectorial membrane – stimulates hair cells

  16. Cochlea

  17. Cochlea

  18. Organ of Corti

  19. Organ of Corti VIII

  20. Hair Cells

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