sense organs Flashcards
tympanic membrane function
transmits sound from outer ear to ossicles
auditory ossicles function
amplify sounds from the air to cochlea
cochlear function
hearing - lined with stereocilia
vestibular apparatus function
balance organ
eustacian tube
protects middle ear from pressure changes
cause otitis externa
swimmers ear
water in ear
cause otitis media
infection
cause labrythitis
head injury, bacterial/viral infection
s/s meniere’s disease
dulled hearing ‘attacks’
verigo
nausea
tinnitus
1 cause of hearing impairment
measles
conjunctiva function
protects cornea/front of eye when shut
lacrimal apparatus function
produces tears
to achieve clear vision, light has to be focussed on the retina this involves
- — of the light rays
- – of the eyes
refraction
accomodation
when light moves from one substance to another with a different density the light rays bend - called
refraction
describe 3 cells types that make up olfactory epithelium
olfactory receptors
supporting cells
basal cells
contraction/relaxation of ciliary muscle to project a sharp image on retina
accomodation
cells in retina that allow us to see in low light but don’t provide colour
rod cells
vision cells in retina that are stimulated by bright light and allow us to see colour
cone cells
chronic inflammation of eye causes itching and eyelid dandruff
blepharitis
s/s blepharitis
redness
burning itching
sticky eyelids on waking
flakes at eyelash base
stye cause
usually staphylococcus
cause uveitis
autoimmune disease
squint cause
genetic
glaucoma cause
obstruction of canal of schlemm (smoking)
glaucamona s/s
pain in eyes
haloes around lights
sensitivity to bright light
watery eye
what does mucous in nose do
moisten olfactory epithelium
dissolve odorants
taste also known as
gustation