CH. 12: Eye Terms

Question 1

eye

Answer 1

organ of vision

Question 2

sclera

Answer 2

outer protective layer of the eye; the portion seen on the anterior portion of the eyeball is referred to as the white of the eye.

Question 3

cornea

Answer 3

transparent anterior part of the sclera, which is anterior to the aqueous humor and lies over the iris. It allows the light rays to enter the eye.

Question 4

uvea

Answer 4

layer of tissue beneath the sclera and cornea; contains the choroid, iris, and ciliary body.

Question 5

choroid

Answer 5

middle layer of the eye, which is interlaced with many blood vessels that supply nutrients to the eye.

Question 6

iris

Answer 6

pigmented muscular structure that regulates the amount of light entering the eye by controlling the size of the pupil.

Question 7

ciliary body

Answer 7

connects the choroid to the iris; produces aqueous humor and helps change the shape of the lens for focusing.

Question 8

pupil

Answer 8

opening in the center of the iris.

Question 9

lens

Answer 9

lies directly behind the pupil; its function is to focus and bend light.

Question 10

retina

Answer 10

innermost layer of the eye, which contains the vision receptors.

Question 11

macula

Answer 11

small portion of the retina at the back of the eye; responsible for detailed central vision.

Question 12

optic nerve

Answer 12

carries visual impulses from the retina to the brain.

Question 13

aqueous humor

Answer 13

watery liquid found in the anterior cavity of the eye. It provides nourishment to nearby structures and maintains shape in the anterior part of the eye.

Question 14

vitreous humor

Answer 14

jellylike substance found behind the lens in the posterior cavity of the eye that maintains its shape.

Question 15

meibomain glands

Answer 15

oil glands found in the upper and lower edges of the eyelids that help lubricate the eye (also called tarsal glands).

Question 16

lacrimal apparatus

Answer 16

network of glands, ducts, canals, and sacs that produce and drain tears; the lacrimal gland produces tears, which then flow through the lacrimal ducts to cover the surface of the eye. Tears drain into lacrimal canals, flow into the lacrimal sac (tear sac) and then into the nasolacrimal duct, which opens into the nasal cavity.

Question 17

conjunctiva

Answer 17

mucous membrane lining the eyelids and covering the anterior portion of the sclera.