special senses Flashcards
what does the eye do?
Receives light rays and transmits impulses from the rays to the optic nerve
conjunctiva
the mucous membrane, lines the eyelids
outermost layers of the eye
scerla, and the cornea
scerla
maintains the shape pf the eye, known as the white of the eye
cornea
allows light rays to pass through
middle layer of the eye
Choroids coat
choroids coat
interlaced with many blood vessels, nourishes the eye
intermost layer of the eye
retina, cones, rods
retina
transmits light impulse to the optic nerve
cones
It is sensitive to color, used mainly for vision when it is light,
rods
used for vision when it is dark or dim
iris
Located behind the cornea on the front of the choroids coat
pupil
opening center of the eye
Lens
Refracts light rays so the rays focus on the retina.
aqueous humor
fluid that fills the space between the cornea and iris, Helps maintain the forward curvature of the eyeball and refracts light rays
Vitreous Humor
Jellylike substances that fills the area behind the lens, Helps maintain the shape of the eyeball and also reflects lights