Chapter 8 Special Senses: Ear and Eye Flashcards
general senses found in skin
pain
touch
pressure
temp
proprioception
special senses
gustation
olfaction
hearing
equilibrium
vision
equilibrium
balance
gustation
taste
hearing
sound
olfaction
smell
proprioception
posture, movement, changes in equilibrium
tactile
touch
vision
light t o sight
-esthesia
sensation
-algesia
pai n
-osmia
sense of smell
-geusia
taste
pinna
projection of ear, also called auricle (where you get piercings)
auricle
also called pinna, projection of ear
external auditory canal
where earwax collects, called meatus too
meatus
external auditory canal
tympanic membrane
also called eardrum, before malleus, deep to meatus
cerumen
earwax
- protection
- infection prevention
ossicles
small bones
- malleus
- incus
- stapes
auditory tube
eustachian tube
- connects middle ear with nasopharynx
- equalizes pressure between outer ear and middle ear
how is the inner ear described?
labyrinth
- complex shape!!!
cochlea
snail shell
spiral organ
part of cochlea that allows for hearing
also called organ of Corti
organ of corti
also called spiral organ
cells respond to sound
vestibular apparatus
sense of equilibrium
- semicircular canals
- vestibule
vestibulocochlear nerve
nerve that transmits ear impulses to brain (VII)
incus
Middle ossicle
malleus
middle ossicle
stapes
most deep ossicle
audi/o
hearing
acous
sound, hearing
acus
sound, hearing
cus
sound, hearing
ot/o
ear
myring/o
tympanic membrane
tympan/o
tympanic cavity (middle ear), tympanic membrane
salping/o
tube, auditory tube
staped/o, stapedi/o
stapes
labyrnth/o
labyrinth (inner ear)
vestibul/o
vestibule, vestibular apparatus
cochle/o
cochlea (of inner ear)
sensorineural hearing loss
damage to
- inner ear
- VII nerve
- central auditory pathways
(heredity, toxins, loud noises, aging)
inability to hear frequencies to deafness
COCHLEAR IMPLANT
conductive hearing loss
blockage in sound transmission to inner ear
(infection, obstruction, fixation of ossicles)
often easily cured
otitis media
infection that results in fluid in middle ear
(allergy, enlarged adenoids, injury, congenital, infection)
myringotomy - tube in tympanic membrane to drain fluid
otitis externa
inflammation of external auditory canal
swimmer’s ear (infection)
otosclerosis
body of inner ear deteriorates and reforms into spongy tissue that may harden
- stapes fixated to inner ear, unable to vibrate (conductive hearing loss)
STAPEDECTOMY (prosthetic stapes inserted as replacement)
MÉNIÈRE DISEASE
inner ear
- malfunction of fluid production and circulation
- vertigo, tinnitus, pressure in ear
- drugs
-Vestibulocochlear nerve may become damaged in severe cases
acoustic neuroma
tumor from neurilemma of surrounding nerves (schwannoma, neurilemmoma)
- decreased blood supply, surgery needed
Orbit
bony socket that eye resides in
palpebrae
eyelids
lacrimal glands
tear glands
conjunctiva
thin membrane that lines eyelids and covers anterior portion of eye
sclera
outermost layer of eye, WHITE
extends over anterior portion and meets with c ornea
cornea
transparent curved outer portion of anterior eye
uvea
choroid
ciliary body
iris
choroid
vascular and pigmented layer of posterior eye
nourishment for retina
ciliary body
muscle to control shape of lens for near/far vision
ACCOMODATION
accomodation
ciliary body contracts and relaxes to reshape the lens for near and far vision; near vision requires a more rounded lens
iris
muscular ring to control pupil size
- regulates light that enters eye
pupil
opening of iris
retina
visual receptor area deep to choroid plexus
- contains rods and cones
rods
dim light
- sharpness
- do not respond to color
cones
bright light
- high visual acuity
- COLOR
refraction
bending of light rays as they pass through the eyes
how is visual information transmitted to brain
optic nerve II
opticv disk
where optic nerve II connects to eye; no visual information here, blind spot because no rods or cones
fovea
high concentration of cones for highest visual acuity
macula
surrounds fovea, yellow
vitreous body
jelly like fluid that fills eye
shapes eye
refracts light
aqueous humor
fluid that fills space between the lens and cornea
convergence
6 muscles converge at eye to produce coordinated eye movements so they can focus on the same spots
visual acuity
sharpness of vision
blephar/o
eyelid
palpabr/o
eyelid
dacry/o
tear, lacrimal apparatus
dacryocyst/o
lacrimal sac
lacrim/o
tear, lacrimal apparatus
opt/o
eye, vision
ocul/o
eye
opthalm/o
eye
scler/o
sclera
corne/o
cornea
kerat/o
cornea
lent/i
lens
phak/o, phac/o
lens
uve/o
uvea
chori/o, choroid/o
choroid
cycl/o
ciliary body, ciliary muscle
ir, irit/o, irid/o
iris
pupill/o
pupil
retin/o
retina
-opia
condition of vision
-opia
condition of eye/vision
myopia
nearsightnedness (long eye, things appear before the retina)
hyperopia
farsightedness (short eye, things appear behind the retina)
astigmatism
irregularity of corneal curve that distorts light entering eye
- blurs visionq
conjuntivitis
inflammation of conjunctiva
trachoma
inflammation of cornea and conjunctiva that causes scarring (antibiotics/sulfa drugs)
uncommon in USA but can cause blindness in other countries
ophthalmia neonatorum
gonorrhea causes acute conjunctivitis in newborns; erythromycin used to prevent
retinal detachment
retina separates from choroid and cause blindness
- laser
macular degeneration
spot degenerates, caused by
- aging
- drug toxicity
- hereditary diseases
CENTRAL VISION IMPACTED AND NOT PERIPHERAL
AMD
age related macular degenerationdr
dry AMD
material accumulates on retina (supplements may delay)
wet AMD
abnormal blood vessels grow under retina - detachment
intraocular injections to prevent
laser treatment (stop blood vessel growth)
diabetic retinopathy
circulation problems with diabetes mellitus
changes to retina
vascular damage, lipoprotein exudate (new blood vessels go into vitreous humor and hemorrhage)
cataract
opacity of lens that blurs vision
(age, environment, UV light)
phacoemulsification
cataract removal where lens anterior capsule is removed by high frequency ultrasound to break it up with subsequent extraction
glaucoma
increase of pressure within eyeball
too much aqueous humor, puts pressure on blood vessels and on optic nerve II (rubella in fetus can cause glaucoma, cataracts, hearing loss)
presbyopia
changes in eye that happen with age (lens elasticity loss, inability to accommodate for near vision)
homonymous hemianopia
loss of vision in half of the visual field in both eyes on the same side
exopthalmos
protrusion of eyeball (proptosis)
anacusis
total deafness
ORL
otorhinolaryngology