Ears Flashcards
sense organ of hearing and equilibrium
ear
3 distinct part of ears
external ear
middle ear
inner ear
what separates the external ear from the middle ear
tympanic membrane
distinct part of the ear that used in testing hearing acuity
middle and inner ear
external ear is composed if
auricle, pinna and the external auditory canal
s-shaped in the adult
external auditory canal
Modified sweat glands in the external ear canal secrete
cerumen
a wax-like substance that keeps the tympanic membrane soft
cerumen
has bacteriostatic properties, and its sticky consistency serves as a defense against foreign bodies.
cerumen
pearly gray appearance and serves as a partition stretched across the inner end of the auditory canal
tympanic membrane
concave and located at the end of the auditory canal in a tilted position such that the top of the membrane is closer to the auditory meatus than the bottom.
tympanic membrane
nearest auditory ossicle that can be seen through the translucent membrane
Handle and short process of the malleus
the base of the malleus, also serving as a center point landmark
umbo
the reflection of the otoscope light seen as a cone due to the concave nature of the membrane
cone of light
the top portion of the membrane that appears to be less taut than the bottom portion
pars flaccida
the bottom of the membrane that appears to be taut
pars tensa
tympanic cavity, is a small, air-filled chamber in the temporal bone.
middle ear
the middle ear contains 3 auditory ossicles
malleus
incus
stapes
These tiny bones are responsible for transmitting sound waves from the eardrum to the inner ear through the oval window.
malleus
incus
stapes
air pressure is equalized on both sides of the tympanic membrane and connects the middle ear to the nasopharynx
eustachian tube
labyrinth
inner ear
fluid filled and made up of the bony labyrinth and an inner membranous labyrinth.
inner ear
the inner cochlear duct contains the spiral organ which is the sensory organ for hearing
corti
where is the sensory receptors located
vestibule and in the membranous semicircular canals
sense position and head movements to help maintain both static and dynamic
sensory receptors
Nerve fibers from these areas form the vestibular nerve, which connects with the cochlear nerve to form:
eighth cranial nerve the acoustic or vestibulocochlear nerve
transmission of sound waves through the external and middle ear is referred to as
conductive hearing
transmission of sound waves in the inner ear
perceptive or sensorineural hearing
dysfunction of the external ear or middle ear
conductive hearing loss
impacted earwax, otitis media, foreign object, perforated eardrum, drainage in the middle ear or otosclerosis
conductive hearing loss
organ of corti, cranial nerve 8 or temporal lobe of brain
perceptive or sensorineural
characterized by an increased sensitivity to certain frequencies and volume ranges of sound (a collapsed tolerance to usual environmental sound)
hyperacusis
condition of having non serviceable hearing in one ear
single sided deafness
occurs when a virus or bacteria cause the area behind the eardrum to become inflamed
otitis media
condition when one of the two vestibular nerves that send information to the brain about spatial navigation and balance control becomes inflamed
labyrinthitis
disorder of the inner ear that can lead to dizzy spells (vertigo) and hearing loss
meniere’s disease
ringing in the ears
tinnitus
normal size of ears
4 to 10 cm
enlarged pre-auricular and post-auricular lymph nodes
infection
tophi non-tender, hard, cream-colored nodules on the helix or anti-helix, containing uric acid crystals
gout
ulcerated, crusted nodules that bleed
skin cancer
redness, swelling, scaling or itching
otitis externa
pale blue ear color
frostbite
tenderness over the mastoid process suggests?
mastoiditis
A painful auricle or tragus
otitis externa or a post-auricular cyst
