Eye and Vision Flashcards
Exam 3
what are the accessory structures of the eye
palpebrae
eyelashes
muscles
conjunctiva
lacrimal apparatus
what is the lacrimal apparatus function
to wash and clean eye surface
what does the lacrimal gland do
secretes tears
what are the components anatomically of the lacrimal apparatus
lacrimal gland
lacrimal ducts
lacrimal canaliculi
lacrimal sac
nasolacrimal duct
nasal cavity
what do extrinsic eye muscles do
move eyeball
what are the 6 extrinsic eye muscles
superior rectus
inferior rectus
medial rectus
lateral rectus
superior oblique
inferior oblique
superior rectus fxn
look up
inferior rectus fxn
look down
medial rectus fxn
loook towards nose
lateral rectus mescle fxn
look away from nose
superior oblique muscle fxn
look downward and lateral
inferior oblique muscle fxn
look upward and medially
generic parts of the eye
fibrous tunic
vascular tunic
nervous tunic
anterior cavity
lens
posterior cavity
fibrous tunic fxn
support/physical protection. the attachment site for extrensis eye muscles
vascular tunic does what
is a dark pigment absorbing excess light . has capillaries and lymphatics
what is the nervous tunic
retina
what is in the anterior cavity
anterior and posterior chamber
what does the lens do
focus light on the retina
what are the 2 components of fibrous tunic
sclera
cornea
what is the sclera
white part of eye
what is the cornea
front portion of eye
what is the corneum epithelium
outmost barrier of cornea
what is the conjuctivia
part of the fibrous tunic, superficial, extends off eye like a curve
what are the main parts of the vascular tunic
choroid
ciliary body
Iris
what are the 3 parts of ciliary body
ciliary muscles
ciliary processes
suspensory ligament
ciliary muslces def
intrinsic eye muslces that control lens shape
ciliary processes def
epithelium that makes aquous humor
suspensory ligament def
connect cilary muscles to the lens
where is the cilariy muscles location
in the ciliary body of the vascular tunic of the eye
where is the choroid location
vascular tunic
where is the cornea location
in the fibrous tunic of the eye
iris def
intrisnic eye muscles that control diameter of puil
what are the 3 parts of iris
pupil
radial muscles
circular muslces
what do radial muslces do
make it bigger (pupil)
fxn of iris
what do circular muscles do
make it smaller (pupil)
fxn of iris
what is apart of the nervous tunic
retina
what does the retina contain
photoreceptors
what are the 2 photreceptors. what do each see
cones . acuity/color
rods . low vision/b+w
what is the copora lutea
part of the neural part of the retina
is mostly cones
has the highest visual activity
what is in the fuvea centralis
cones only
what is the optic disk
blind spot, where the optic never exits
what does the optic disk lack
photoreceptors
what does the fovea centralis look like
that liitle indent in the circle
what does the copora lutea surround
the fovea centralis
what is the main part of the anterior cavity
aqueous humor
how is aqueous humor formed and resorped
enters at posterior chamer , through pupil, and then out through the anterior chamer
what is the function of aqueous humor
nourish the cornea/lens
what is in the posterior cavity
vitreous humor
where is aqueous humor
vs
vitreous humor
anterior cavity
vs
posterior cavity
function of the vitreous humor
maintian shape of eye
hold retina against choroid
funciton of lens
focus light on retina
refraction of light
farther needs more of less bending
little bending
flatter lens
closer needs more or less bending
more bending
rounder lens
