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8 Cards in this Set
- Front
- Back
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What is the tympanic membrane and what is its function
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separates the external and middle ear. It moves in response to air vibrations that pass to it through the external acoustic meatus.
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Borders of the middle ear
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Roof: tegmental wall
Floor: jugular wall Lateral wall: membranous (tympanic membrane) Medial wall: labyrinthine Posterior wall: mastoid Anterior wall: carotid |
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Contents of middle ear
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ossicles, stapdius and tensor tympani mm, chorda tympani N (VII), tympanic plexus of nerves
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what nerves are found in the middle ear?
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chorda tympani N, lesser petrosal nerve, tympanic nerve (from IX) to form tympanic plexus
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Function of pharyngotympanic/eustachia/ auditory tube
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Tube from middle ear to pharyn that allows pressure to be equalized in middle ear with atmospheric air... and thus allowing free movement of tympanic membrane
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Tensory tympani fxt and innervation
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inserts onto the malleus, pulls it medially, tensing the tympnaic membrane and reducing amplitude of oscillations. Protective measure for loud sounds. V3
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Stapedius fxt and innervation
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Prevents excessive movt of stapes. CN VII
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three ossicles in order and what they attach to
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malleus to incus to stapes
Malleus attatches to tympanic membrane Stapes attatches to oval windown on Labyrinthine (medial) wall |
