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Ear Anatomy
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Auricle
Blood supply
?
Innervation?
Auric)le
Blood supply
: Post. Auricular A.
Innervation
:
Post. Auricular n. (CN VII - motor)
Lesser Occipital & Greater Auricular n. (sensory)
External Acoustic Meatus
Blood Supply
Innervation
External Acoustic Meatus
Blood Supply
: Post. auricular, maxillary, superficial temporal (AMT)
Innervation
:
Auriculotemporal (CN V3)
Auricular br. CN IX & X(Arnold n.)
Facial n.
Middle ear (tympanic membrane) boundaries?
Roof
tegmen tympani
Middle ear (tympanic membrane) boundaries?
Floor
jugular foramen w/IJV posteriorly & ICA anteriorly
Middle ear (tympanic membrane) boundaries?
Lateral & Medial Wall
Lateral
:
tympanic membrane
malleus-umbo
pars flacida (malleolar folds)
Medial:
promontory w/tympanic plexus
fenestra vestibuli (OW)
fenestra cochlea (RW)
Middle ear (tympanic membrane) boundaries?
Posterior & Anterior Walls
Posterior:
mastoid antrum
stapedius m.
facial canal
Anterior:
canal for tensor tympani & PT tube
ICA
Middle ear (tympanic cavity) contents?
Nerves
chorda tympani (CN VII)
tympanic br. of IX
tympanic plexus (greater petrosal - lacrimal & lesser petrosal - parotid)
Middle ear (tympanic cavity) contents?
Arteries & Veins
Ateries
m
axillary a.
m
iddle meningeal
v
idian a. - pterygoid canal a.
ascending
p
haryngeal a.
ICA
Veins:
Pterygoid venous plexus --> cavernous sinus
Middle ear (tympanic cavity) contents?
Lymphatics
deep cervical LN
Middle ear (tympanic cavity) contents?
Muscles
Tensor tympani - CN V
3
Stapedius - CN VII
auditory reflex
: contract w/loud sounds
Otitis media
infection of cavity from nasopharynx
Hyperacusis
paralysis of stapedius (CN VII)
Hypoacusis
paralysis of tensor tympani (CN V3)
Weber Test
normal
: no lateralization
conductive deafness
: hear louder on affected side
sensorineural deafness
: hear louder on unaffected side
Rinne's Test
normal
: BC=AC
conductive deafness
: BC > AC
sensorineural deafness
: AC > BC
Auditory Reflex
axons from Sup. Olivary N. terminate in Trigeminal & Facial motor nuclei
stapedius - VII
tensor tympani - V3
Author
catitasilva
ID
122524
Card Set
Ear Anatomy
Description
Ear anatomy
Updated
2011-12-10T22:47:41Z
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