Chapter 17- Sense Organs: The Eye and The Ear Flashcards Preview

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Flashcards in Chapter 17- Sense Organs: The Eye and The Ear Deck (175)
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1

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

accomodation

2

area behind the cornea and in front of the lens and iris. It contains aqueous humor.

anterior chamber

3

fluid produced by the ciliary body and found in the anterior chamber. A humor is any body fluid, including blood and lymph.

aqueous humor

4

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.

biconvex

5

middle, vascular layer of the eye, between the retina and the sclera

choroid

6

structure surrounding the lens that connects the choroid and iris. It secretes aqueous humor.

ciliary body

7

photoreceptor cell in the retina that transforms light energy into a nerve impulse. Cones are responsible for color and central vision.

cone

8

delecate membrane lining the undersurface of the eyelids and covering the anterior eyeball.

conjunctiva

9

fibrous transparent laer of clear tissue that extends over the anterior portion of the eyeball.

cornea

10

tiny pit or depression in the retina that is the region of clearest vision

fovea centralis

11

posterior, inner part of the eye

fundus of the eye

12

pigmented layer that opens and clsoes to allow more or less light into the eye.

iris

13

central opening of the iris

pupil

14

transparent, biconvex body behind the pupil of the eye. Bends light rays to bring them into focus on the retina

lens

15

yellowish region on the retina lateral to and slightly below the optic disc; contains the fovea centralis

macula

16

point at which optic nerve fibers cross in the brain

optic chiasm

17

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

optic disc

18

cranial nerve carrying impulses from the retina to the brain

optic nerve

19

central opening of the eye surrounded by the irus through which light rays pass. appears dark

pupil

20

bending of light rays by the cornea, lens, and fluids of the eye to bring the rays into focus on the retina.

refraction

21

light sensitive nerve cell layer of the eye containing photoreceptor cells (rods and cones)

retina

22

photoreceptor cell of the retina essential for vision in dim light and for peripheral vision

rod

23

tough white outer coat of the eyeball

sclera

24

relay center of the brain. optic nerve fibers pass through the thalamus on their way to the cerebral cortex

thalamus

25

soft, jelly-like material behind the lens in the vitreous chamber; helps maintain the shape of the eyeball

vitreous humor

26

water

aqueo

27

eyelid

blepharo / palpebro

28

inflammation of the eyelid causing redness, crusting, and swelling along lid margins

blepharitis

29

conjunctiva

conjunctivo

30

pinkeye: blood vessels dilate from allergens like pollen, bacterial infection, or virus

allergic, bacterial, viral CONJUNCTIVITIS