Flashcards in Chapter 17- Sense Organs: The Eye and The Ear Deck (175)
Normal adjustment of the eye to focus on objects from far to near. The ciliary body adjusts the lens and the pupil constricts. When the eye focuses from near to far, the ciliary body flattens the lens and the pupil dilates
area behind the cornea and in front of the lens and iris. It contains aqueous humor.
fluid produced by the ciliary body and found in the anterior chamber. A humor is any body fluid, including blood and lymph.
consisting of two surfaces that are rounded, elevated, and curved evenly, like part of a sphere. The lens of the eye is a biconvex body.
middle, vascular layer of the eye, between the retina and the sclera
structure surrounding the lens that connects the choroid and iris. It secretes aqueous humor.
photoreceptor cell in the retina that transforms light energy into a nerve impulse. Cones are responsible for color and central vision.
delecate membrane lining the undersurface of the eyelids and covering the anterior eyeball.
fibrous transparent laer of clear tissue that extends over the anterior portion of the eyeball.
tiny pit or depression in the retina that is the region of clearest vision
posterior, inner part of the eye
fundus of the eye
pigmented layer that opens and clsoes to allow more or less light into the eye.
central opening of the iris
transparent, biconvex body behind the pupil of the eye. Bends light rays to bring them into focus on the retina
yellowish region on the retina lateral to and slightly below the optic disc; contains the fovea centralis
point at which optic nerve fibers cross in the brain
region at the back of the eye where the optic nerve meets the retina. It's a blind spot of the eye because it contains only nerve fibers, no rods and cones and thus is insensitive to light
cranial nerve carrying impulses from the retina to the brain
central opening of the eye surrounded by the irus through which light rays pass. appears dark
bending of light rays by the cornea, lens, and fluids of the eye to bring the rays into focus on the retina.
light sensitive nerve cell layer of the eye containing photoreceptor cells (rods and cones)
photoreceptor cell of the retina essential for vision in dim light and for peripheral vision
tough white outer coat of the eyeball
relay center of the brain. optic nerve fibers pass through the thalamus on their way to the cerebral cortex
soft, jelly-like material behind the lens in the vitreous chamber; helps maintain the shape of the eyeball
blepharo / palpebro
inflammation of the eyelid causing redness, crusting, and swelling along lid margins