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Assignment 3 (gross and microscopic anatomy of eye (Posterior segment…
Assignment 3
gross and microscopic anatomy of eye
Fibrous layer
sclera
dense connective tissue, protective
anchor for muscle
gives shape
cornea
transparent, allows light into eye
helps focus light
vascular layer
choroid
black
vascular
nourishes other tunics
absorbs light
prevents light from scattering
continuous with ciliary body
Inner layer
retina
contains photoreceptors
color - tan
axons from photoreceptors converge and become optic nerve
Rods
sensetive to light
used in dim light
more numerous than cones
cones
work best in bright light
used for color
lens
posterior to iris
focuses light on retina
Iris
dilate/constrict to allow more/less light into the eye
posterior to cornea
pupil
opening
optic disc
no photoreceptors
"Blind spot"
axons converge to form the optic nerve
Macula Lutea
sharpest vission
only cones
posterior pole
fovea centralis
center of macula latea
Posterior segment
transmit light
support retina and lens
viscous liquid
mantain a normal pressure and shape of eye
filled with vitreous humor
Anterior segment
helps maintain pressure
transmit light
filled with aqueous humor
nourishes lens and cornea
receptors based on type of stimulus
Thermoreceptor
sensitive to heat
have thermoreceptors for cold and warm
Photoreceptor
sensitive to light
Chemoreceptor
sensitive to chemicals
Nociceptor
sensitive to pain
Mechanoreceptor
sensitive to...
touch
vibration
pressure
stretch
Baroreceptor
sensitive to blood pressure
receptors based on stimulus origin
Exteroceptors
sensitive to things outside our bodies
location
spesial sense organs
Interoceptors
stimulus from interior of body
location
internal organs
Proprioceptors
Sensitive to stimulus from...
tendons
ligaments
muscle
joints