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51 Cards in this Set
- Front
- Back
What's between the helix and the antihelix?
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the scaphold fossa
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Besides the scaphold fossa what other fossa is located on the outer ear? and where in relation to the scaphold fossa?
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the triangular fossa which is anterior
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What borders the triangular fossa?
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the helix
and the two crurae of the anthelix |
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What's basically in the middle of the outer ear?
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concha
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Describe the parts of the lower outer ear anterior to posterior then inferior.
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tragus->intertragal notch->antitragic->lobule
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What is the concha of the outer ear innervated by?
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vagus n (CNX)
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What innervates the rest of the outer ear besides the concha?
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C2, C3 innervates posterior and inferior both medial and lateral
auriculotemporal n (V3) innervates superior anterior medial and lateral |
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What's another name for outer ear apparently?
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pinna...it's pulled up and out and back to straighten the EAM
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What's the innervation of the EAM?
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the posterior and floor by X,
the anterior and roof is by auriculotemporal n. the outer layer of the tympanic membrane is dually innervated by these |
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Ear pain can come from distant places innervated by which nerves?
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V, IX, X and C2, C3. because of development...lucky
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What are the 3 layers of the tympanic membrane and what innervates them?
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thin skin (auriculotemporal n and vagus) - fibrous collagenous - thin mucosa (IX)
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What is the shape of the tympanic membrane?
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it's conical and concaved externally where the handle of the malleus is at the apex called the umbo.
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What quadrant is the cone of light found?
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anterior inferior
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How is the quadrant system organized on the tympanic membrane?
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by the manubrium
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What is just superior and inferior of the middle ear?
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superior - temporal lobe
inferior - jugular bulb |
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What are the big landmarks of the medial, lateral, anterior and posterior sides of the middle ear?
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medial - semicircular canals
lateral - tympanic membrane anterior - internal carotid a posterior - mastoid air cells and antrum |
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How does the chorda tympani course near the tympanic membrane?
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It goes between the long process of the incus and the handle of the malleus anteriorly
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What is the relation of the manubrium of the malleus to the incus?
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it's anterior
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where do incisions occur to avoid the ossicles?
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inferior posterior tympanic membrane
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Where's the volcano in the middle ear? and what is it made up of?
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it's on the posterior wall.
it's the pyramidal eminence and the tendon of the stapedius m goes to the stapes anteriorly |
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What are the big landmarks of the medial, lateral, anterior and posterior sides of the middle ear?
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medial - semicircular canals
lateral - tympanic membrane anterior - internal carotid a posterior - mastoid air cells and antrum |
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How does the chorda tympani course near the tympanic membrane?
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It goes between the long process of the incus and the handle of the malleus anteriorly
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What is the relation of the manubrium of the malleus to the incus?
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it's anterior
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where do incisions occur to avoid the ossicles?
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inferior posterior tympanic membrane
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Where's the volcano in the middle ear? and what is it made up of?
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it's on the posterior wall.
it's the pyramidal eminence and the tendon of the stapedius m goes to the stapes anteriorly |
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What makes up the volcano of the middle ear? and what's in it?
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the pyramidal eminence and the tendon of the stapedius course anteriorly to connect with the neck of the stapes
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what makes up the anterior wall of the middle ear?
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the tensor tympani m in canal and the pharyngotympanic tube
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What are in the epitympanic recess?
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the head of the malleus and the body of the incus
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Where does the chorda tympani go after the tympanic membrane?
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it goes to the mandibular fossa and exits the bone via the petrotympanic fissure
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what fibers does the chorda tympani carry?
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taste to the anterior 2/3 of the tongue and preganglionic parasympathetics to the sublingual and submandibular glands
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what makes up the superior part of the posterior wall of the middle ear?
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aditus of the of the mastoid antrum
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What two canals are in the upper posterior part of the medial wall of the middle ear?
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the lateral semicircular canal and the facial canal
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where's the round window?
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it's posterior and inferior of the promontary
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what's between the promontary and the facial nerve
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the footplate of the stapes and the oval window
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Is the incudostapedial joint synovial?
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yes
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where's the tympanic plexus and what does it give off?
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it's the plexus on the promontary and it gives of the lesser petrosal nerve from IX
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Where in relation to the promontary does the tendon of the tensor tympani course?
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superior
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what do the ossicles do?
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they link the ear drum and the cochlea...there's two joints
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what are the 2 main branches of the middle ear?
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anterior tympanic br of maxillary a via the petrotympanic fissure
stylomastoid br of the posterior auricular a of the facial a |
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the cochlea is ___ and the vestible and the semicircular canals are ___
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anteriomedial
posteriolateral |
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What goes through the IAM?
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VII, VIII, labyrinthine a
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What supplies the inner ear?
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the labyrinthine (internal auditory) a off the basilar a
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what is the basilar a?
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it's the artery that is formed superiorly from the two vertebral arteries
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conduction deafness results from what?
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mechanical transmission loss in the external or middle ear
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What is neural deafness?
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transmission loss starting at the receptors
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Bone conduction bypasses what?
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conduction route of outer-middle ear
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What is weber's test
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put the tuning fork at vertex of skull...bone conduction to both ears simultaneously
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What is rhinne's test?
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put tuning fork on mastoid process and then next to ear...repeat for other ear
for neural...no hearing in bad ear, but if using bone conduction will localize to bad ear |
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What direction does the facial n course after passing between the cochlea and the vestible?
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posteriorly at the genu
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The geniculare ganglion has what kind of neurons?
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like DRGs (unipolar neurons)
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Where does the greater petrosal nerve go to from the geniculate ganglion?
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foramen lacerum
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