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middle ear
hearing science
| Question | Answer |
|---|---|
| what are the components of the middle ear | inner layers of the tympanic membrane middle ear cavity ossicles, meallus, incus, stapes esutachian tube ligaments and muscles oval and round windows. |
| what are the components of the middle ear | inner layers of the tympanic membrane middle ear cavity ossicles, meallus, incus, stapes esutachian tube ligaments and muscles oval and round windows. |
| Describe the inner layer of the tympanic membrane (eardrum) | made up of several layers of skin. thin membrane seperates the thin membrane seperates the external ear fm the middle ear. it works in transmitiing sound from the air to the ossicle inside the middle ear. the malleus bone bridges the gap btwn the eardrum |
| describe the middle ear cavity | iregular,laterally closed space within the temporal bone.filled with air (fm the nasopharynx through the eustachian tube)contains ossicular chain whoch connect its lateral wall to its medial wall and serves to convey the vibrations communicated to the ty |
| What are the six walls of the middle cavity | tegmental/roof-Jugular/floor- medial/labyrinthic- anterior/carotid posterior lateral |
| describe the middle ear cavity | iregular,laterally closed space within the temporal bone.filled with air (fm the nasopharynx through the eustachian tube)contains ossicular chain whoch connect its lateral wall to its medial wall and serves to convey the vibrations communicated to the ty |
| tegmental/roof- | formed by thin plate of bone situated on surface of the petrous portion of the temporal bone |
| jugular/floor | narrow consists of thin plate of bone which separates the tympanic cavity fm jugualr fossa |
| tegmental/roof- | formed by thin plate of bone situated on surface of the petrous portion of the temporal bone |
| medial/labyrinthic- | vertical in direction and presents for examination the fenestrae vestibuli (oval window) and conchae (round window) |
| anterior/carotid | corresponds with the carotid canal |
| posterior | contains aditus and antrum through which the epitympanic recess communicates with the mastoid antrum |
| lateral | contains the tympanic membrane. |
| What are the compononets of the ossicles | they are the three smalles bones in the body Malleus(hammer) Incus (anvil) Stapes (stirrup) |
| posterior | contains aditus and antrum through which the epitympanic recess communicates with the mastoid antrum |
| What is the lateral wall of the middle ear cavity | The ear drum (tympanic membrane) |
| What is the function of the ear drum | it works in transmitting sound and blocks the entrance of fine objects into the middle ear. |
| Why are children more prone to having fluid in the middle ear | because the Eustachian tube is shorter ad ,pre horizontal than an adult leading for drainage to be less easy. |
| What is the function of the middle ear | impedance matching device (area ratio difference/.lever action) pressure equalizer( eustachian tube btwn middle ear cavity and nasopharynx) protection(Acoustic reflex) |
| Why are children more prone to having fluid in the middle ear | because the Eustachian tube is shorter ad ,pre horizontal than an adult leading for drainage to be less easy. |
| What is the fucntion of the eustachian tube | equalizes pressure btwn the middle ear cavity and the external auditory meatus (ear canal) by opening and letting air from the nasopharynx go into the middle ear. |
| What is the function of the middle ear | impedance matching device (area ratio difference/.lever action) pressure equalizer( eustachian tube btwn middle ear cavity and nasopharynx) protection(Acoustic reflex) |
| which two nerves pass through the middle ear cavity | glassopharyngeal (12) and the facial nerve (7) |
| How will the middle ear work as an impedance matching device | acosutic energy is lessened by ~30dB when it gets to the inner ear. to compensate the middle amplify the pressure by 28dB. this is done by two processes the first is the area ration which amplifies movement fm the ear drum (surface 1) to the stapes (surf |
| which two nerves pass through the middle ear cavity | glassopharyngeal (12) and the facial nerve (7) |
| Describe the protection function of the middle ear | this refered to as the acoustic reflex which is an involuntary muscle contraction of the stapedius and tensor tympani muscles that occurs in the middle ear in response to high-intensity sound stimuli.(lous sound) the contraction increases with increased |
| How will the middle ear work as an impedance matching device | acosutic energy is lessened by ~30dB when it gets to the inner ear. to compensate the middle amplify the pressure by 28dB. this is done by two processes the first is the area ration which amplifies movement fm the ear drum (surface 1) to the stapes (surf |
| Describe the protection function of the middle ear | this refered to as the acoustic reflex which is an involuntary muscle contraction of the stapedius and tensor tympani muscles that occurs in the middle ear in response to high-intensity sound stimuli.(lous sound) the contraction increases with increased |
Created by:
GHAIDEE