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14 Cards in this Set
- Front
- Back
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What is the vestibular function of the ear?
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Balance
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What does the ear develop from?
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Surface ectoderm and components of the 1st and 2nd pharyngeal arches
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What forms the Otic Vesicle?
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Invagination of the surface ectoderm forms
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What is the Otic Vesicle?
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membranous labyrinth of internal ear
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What forms the eustachian tube & middle ear?
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Endodermal component of 1st pharyngeal pouch
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What forms the external acoustic meatus
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1st pharyngeal groove
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What does Connective tissue from the 1st pharyngeal arch form?
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Malleus and Incus
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What does Connective tissue from the 2nd. Pharyngeal arch form?
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Stapes
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What is the function of the middle ear?
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onvert sound waves into mechanical vibrations & transmit them to internal ear
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What are the layers of the tympanic membrane?
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Ext.: skin of ext. acoustic meatus
Middle : collagen Inner : mucus membrane of middle ear. |
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sound waves make the tympanic membrane vibrate; then what happens?
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transmitted to the attached auditory ossicles, which in turn transmit them to the internal ear
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what is attached to stapes. It is the smallest skeletal muscle in the body. Its contraction tends to dampen the movement of the stapes at the oval window
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Stapedius
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what increases tension on the tympanic membrane?
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The tensor tympani inserts into the malleus..its contraction increases tension
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What is the attenuation reflex?
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reflex protects the internal ear from the damaging effects of very loud sound
2 muscles of middle ear Their contraction makes the chain of ossicles more rigid thus reducing the transmission of vibrations to the inner ear. |
