Chapter 16

Chapter 16 - Chapter 16 Special senses: Hearing and...

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Chapter 16 Special senses: Hearing and Equilibrium 1
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l External Ear ¡ Auricle or pinnae surrounds the ear l Helix l Lobule Anatomy of the Ear 2
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Anatomy of the Ear ¡ External acoustic meatus l Ceruminous glands produce wax l Hair l Sebaceous glands ¡ Tympanic membrane l Separates the outer ear from the middle ear l Vibrates at the same frequency as the sound wave 3
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Figure 17.20 Ear 4
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l Auditory ossicles lever system that transmits the sound wave to the inner ear ¡ Malleus (hammer) ¡ Incus (anvil) ¡ Stapes (stirrup) l Oval window – transmits the coming sound to the inner ear Middle ear- tympanic cavity 5
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Middle ear- tympanic cavity l Round window – secondary tympanic membrane l Auditory, Eustachian or Pharyngotympanic Tube – connects the middle ear with the nasopharynx l Otites media – inflammation of the middle ear. ¡ Myringotomy – lancing of the eardrum 6
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Inner Ear 7
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l Bony or osseous labyrinth surrounds and protects membranous labyrinth ¡ Perilymph – aqueous fluid that fills the bony
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Chapter 16 - Chapter 16 Special senses: Hearing and...

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