ENT Ear Flashcards
(31 cards)
what is the pterion?
H shapes suture between frontal, parietal, temporal and sphenoid (thinnest part of skull)
what nerves does the temporal bone contain?
CN7 and CN8
what are the two parts of the temporal bone?
petrous and squamous
what does the IAM contain?
CN7
CN8
labyrinthine artery and vein
what glands produce earwax?
ceruminous glands
in a child, what way is the ear pulled for otoscopy?
posteroinferiorly
in an adult, what way is the ear pulled for otoscopy?
posterosuperiorly
tympanic membrane - external and internal surface nerve supply?
external - CN V3
internal - CN 9
what does CN 9 supply sensory innervation to?
middle ear
eustachian tube
nasopharynx
oropharynx
tonsils
what fits into the oval window?
base of stapes
what joints do auditory ossicles articulate via?
synovial joints
what bone does the tensor tympani muscle come off?
malleus
nerve supply of tensor tympani muscle?
CNV3
what does the eustachian tube connect?
anterior wall of middle ear to nasopharynx
laryngopharynx nerve supply?
CN10
function of tensor tympani?
dampens noise produced by chewing
supply of stapedius muscle?
CN7
function of stapedius?
reduces stapes movement to protect the internal ear from excessive noise
what are the two parts of CN8?
cochlear and vestibular nerves
where is the otic capsule?
temporal bone
what movement change do semicircular ducts detect?
angular movement change
what movement change do the utricle and saccule detect?
linear (combined)
utricle - horizontal
saccule - vertical
what are clusters of hair cells called in the inner ear?
maculae
