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Module XIII Terms - Sensory System


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efferent
nerves from the brain to target tissues/motor function
afferent
nerve signals going towards the brain
sclera
outer layer of eye/white
choroid
middle layer of eye/contains capillaries
retina
innermost layer of eye/contains photoreceptors
pupil
allows light to pass through eye
lens
clear structure of eye which changes shape allowing for magnification
uvea
iris, cilliary body, and choroid
rods
black and white photoreceptors
cones
color vision
optic disc
where the optic nerve exits the eye
macula
oval yellowish area surrounding the fovea near the center of the retina which is the region of keenest vision.
fovea
small depression in retina where visual acuity is highest/ center of field of vision/ where cones are particularly concentrated.
anterior cavity
between the cornea and iris/contains aqueous humor
posterior cavity
between iris and lens/contains aqueous humor
vitreous cavity
posterior chamber of eye/contains vitreous humor
auricle
(pinna) external ear
middle ear
contains ossicles and ear drum
inner ear
contains cochlea
organ of corti
sensitive element in the inner ear and can be thought of as the body's microphone
semicircular canals
three fluid-filled bony channels in the inner ear/balance
conductive hearing
external and middle ear
neuro-sensory hearing
inner ear/auditory nerve
audi(o)
hearing (not aur(o))
aur(o)
hearing (not audito)
cerumin(o)
wax
cochle(o)
cochlea
cor(o)
pupil
cycl(o)
cilliary body
dacry(o)
tears (not lacrim(o))
ir(o)
(or irid(o)) iris
kerat(o)
cornea
lacrim(o)
tears (not dacry(o))
myring(o)
eardrum or middle ear (not tympan(o))
ocul(o)
eye
phak(o)
(or phac(o)) lens
scler(o)
white of eye
scot(o)
darkness
tympan(o)
eardrum/middle ear (not myring(o))
uve(o)
uvea
opt(o)
eye (not opthalm(o))
opthalm(o)
eye (not opt(o))
ossicul(o)
ossicles of middle ear
AD
right ear
AS
left ear
AU
both ears
OD
right eye
OS
left eye
OU
both eyes
IOL
intra-ocular lens
IOP
intra-ocular pressure
tonometry
measure of pressure inside the eye
diopter
unit of refraction power to correct vision
audiometry
measure hearing defecits/measuring hearing acuity for variations in sound intensity and pitch
otoscopy
examination of ear through a scope
astigmatism
distortion of light where light rays do not come to a single focus on retina
hyperopia
farsightedness/focus light behind retina
myopia
nearsightedness/focus light in front of retina
strabismus
eye misalignment/cross-eyed
diplopia
double vision
cataracts
cloudiness of lens
glaucoma
increased pressure in eye due to excess aqueous humor
macular degeneration
loss of macula leading to central vision loss
nyctalopia
inability to see in low light/at night
chalazion
nodular inflammation of eyelid
keratitis
inflammation of cornea
anacusis
total hearing loss
paracusis
impaired hearing
presbycusis
age-related hearing loss
otosclerosis
scarring of ossicles/conductive hearing loss
tinnitus
ringing in ear
otalgia
ear pain
cholesteatoma
fatty cyst in middle ear
Meniere's
inner ear disorder/vertigo and dizziness
mydriatic
medication which dilates pupils
miotic
medication which contracts pupil