ear Flashcards
what functional deficit would you have if you damaged the deep petrosal nerve?
its mostly vasomotor except for dilation of pupil. it’ll affect secretions of nose, palate
bones of lacrimal sac
maxilla, lacrimal bone
bones of trigeminal ganglion
greater wing of sphenoid
accomodation of lens
psym @ brainstem > synapse @ ciliary g. > short ciliary n > choroid > constrict ciliary m. > relaxes zonular fibers
what two bones make the zygomatic arch
zygomatic and temporal
bone of carotid canal
temporal
groove for pharyngotypanic tube is for what? made of?
for eustacian tube. part is cartilagenous, part is bony. its between sphenoid and temporal
common places for piercing (inferior to superior)
lobule, scapha, helix
innerv. of anterior portion of ear
auriculotemporal n. (V3)
cranial nerves of cutaneous ear
V, VII, IX, X (also cervical plexus)
where is chorda tympani n from? end up?
from VII, through tympanic cavity, joins with lingual nerve (V3)
what are the two roots of trigeminal n
motor and sensory
muscle in the roof of the eustacian tube
tensor tympani; attaches to malleous, and helps to dampen vibrations; think trigeminal.
a muscle that wraps around the pterygoid hamulus
tensor veli palatini. the nerve is named the same.
general direction of lymph from ear
antioriorly to parotid or posteriorly to mastoid nodes, then down to deep cervical nodes
blood supply to auricle
mainly superficial temporal from ECA
vessels to deeper ear
deep auricular, anterior tympanic branches from maxillary (from ECA)
roof of the middle ear
epitympanic recess made by tegman tympani where the malleus and incus articulate
stapes sits?
oval window
how many turns does the cochlea have
two and a half IN, then two and a half back OUT
where does the cochlea fluid turn around to come back
helicotrema of cochlea
promentory of ear
tympanic plexus from tympanic nerve (IX)
whats in the internal acoustic meatus
F,I,C,IV,SV (facial, intermedius, cochlear, inverior vestibular, superior vestibular)
the parts of ear you can see through the ear drum
umbo, handle lateral process of the malleolus, cochlear window
name something you don’t want in your ear, and what you’d do before you take it out
maggots, ear ticks, ear ants; anesthetize it or kill it so it doesn’t scrape on the way out
how could you get a perforation of eardrum
loud noises, Qtip, pressure
what muscle related to the eustacian tube is innervated by CN X
levator veli palatini
relationship between ICA, and IJV
ICA is anterior to IJV
entrance to the mastoid air cells
antrum
medial wall of the tympanic cavity has?
has the promentory and the canal for the facial nerve
posterior wall of the tympanic cavity
mastoid wall
___ connects the ___ to the oval window
annular stapedial ligament, stapes
t/f all motor nerves related to VII are SVE
true
ICA is ___ and ___ to the eustacian tube
at base of the skull, it is posterior, in the skull it becomes superior
which muscles keep you from getting food in your nose?
levator and tensor tympanini
t/f the cochlea is separated from the semicircular ducts
FALSE. they are connected via the ductus reuniens
what duct connects ear to the arachnoid space
cochlear aqueduct
if you are seasick (slow motion) what area of the ear is responsible?
the saccule and utricle. superior, inferior branches of vestibulocochlear nerve
what are the three parts of the cochlear duct
scala vestibuli, cochlear duct, scala tympani
where is the basilar membrane?
between the scala tympani and the cochlear duct (which has the tectorial membrane)
what produces endolymph
vascular stria
where do the nerves emerge in the cochlea? what are the ganglia in there?
bony medioleus, spiral ganglion
where is reissner’s membrane
between scala vestibuli and cochlear duct
how many limbs of the semicircular canal? ampulla?
5 limbs, 3 ampulla
hearing loss due to?
loss of hair cells (from drugs, loud noises, getting old)
besides the cochlea, where else could you find hair cells?
[ampulla, for spinning]; [utricle, saccule; for tilt]
blood supply to deeeeeep (inner) ear
labyrinthe artery from anterior inferior cerebellar artery
