Term
| How many regions is the ear composed of and what are they called? |
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Definition
| 3: External, inner, and middle |
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Term
| What are the physical properties (in terms of composition) of the external acoustic meatus? |
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Definition
| outer 1/3 cartilage, inner 2/3 bone |
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Term
| What seperates the middle ear from the external ear? |
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Definition
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Term
| What is the name for an infection of the outer ear? |
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Definition
| Otitis Externus or swimmers ear |
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Term
| What are the two divisions of the external ear? |
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Definition
1. Auricle:
2. External Acoustic meatus |
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Term
| What are two important regions of the middle ear (especially when talking about infenction)? |
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Definition
| Mastoid air cells of mastoid process and nasopharynx |
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Term
| What is the part of the middle ear that opens into the nasopharynx? |
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Definition
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Term
| What is the name for an infection of the middle ear? |
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Definition
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Term
| What are the bones of the middle ear? |
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Definition
The ausicles:
Incus
Malleus
Stapes |
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Term
| What forms the roof of the middle ear? |
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Definition
| Petrous part of temporal bone (middle cranial fossa) |
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Term
| What critical structure can be affected when the roof of the middle ear has a bad enough fracture or infection? |
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Definition
| Remember that the roof of the middle ear is composed of the petrous part of the temporal bone. Compromise here can have adverse affects on the temporal lobe of the brain (specifically meninges surrounding it) |
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Term
| What important structure sits just below the floor of the middle ear? |
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Definition
| Jugular foramen (has nerves 9,10, and 11 and the internal jugular vein) |
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Term
| What muscle attaches to the malleus and what is it enervated by? |
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Definition
| Tensor tympani malleus. CN V3 (mandibular) |
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Term
| What muscle attaches to the stapes and what is it enervated by? |
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Definition
| Stapedius, enervated by Cranial Nerve 7 |
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Term
| What happens when the muscles attached to the ossicles contract? |
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Definition
| Prevent vibration, dampen sound |
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Term
| What nerve runes can be found near the lateral wall of the middle ear, running over the malleus? |
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Definition
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Term
| What is the cone of light? Where is it found? |
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Definition
| Cone of light is an opacity in the lower anterior quadrant (II) where infections can be detected |
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Term
| In which quadrants is the Chorda Tympani found? |
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Definition
| Upper anterior and upper posterior quadrant (IV and I) |
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Term
| In what quadrant is the Stapedius muscle found? |
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Definition
| Quadrant III, Lower Posterior Quadrant |
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Term
| What are the major structures of the medial wall of the middle ear? |
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Definition
Stapes,
Promontory,
Tympanic Plexus (CN IX)
Lesser Petrosal nerve (CN IX)
Tympanic branch of CN IX |
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Term
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Definition
| The first turn of the cochlea |
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Term
| What are the major structures associated with the anterior wall ear? |
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Definition
| Tensor tympani muscle, auditory tube, and internal carotid artery |
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Term
| What are the major structures associated with the posterior wall of the middle ear? |
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Definition
Aditus (opening) to the mastoid,
Stapedius muscle |
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Term
| What are the major structures associated with the lateral wall of the middle ear? |
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Definition
Malleus,
Chorda Tympani,
Tympanic Membrane |
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Term
| What is the ganglion that contains cell bodies associated with balance? |
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Definition
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Term
| What ganglion is associated with hearing? |
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Definition
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Term
| What are the labryniths of the innner ear? |
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Definition
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Term
| What is the name of the opening into the innner ear? |
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Definition
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Term
| Canals of the inner ear are what kind of labrynith? |
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Definition
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Term
| Cochlea is what kind of labryinth? |
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Definition
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Term
| What is the secondary tympanic membrane covering? |
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Definition
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Term
| Ducts are associated with what kind of labryinth? |
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Definition
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Term
| Compression at the internal acoustic meatus would affect which nerves? |
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Definition
| Facial and Vestibulocochlear nerve |
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