Internal Structure

Question 1

Choroid

Answer 1

Middle layer of the eyeball, between the sclera and the retina.
Pigmented black, preventing internal reflection of light.
Contains blood vessels that bring oxygen and nutrients to the eyeball and
remove metabolic waste products.

Question 2

Retina

Answer 2

Innermost layer of eyeball which contains photoreceptors

Question 3

Lens

Answer 3

Transparent biconvex structure that refracts light onto the retina. Its
curvature can change to focus light onto the retina.

Question 4

Fovea (Yellow spot)

Answer 4

A small yellow depression in the retina where light rays are usually focused to
form sharp images. (contains highest concentration of cones)

Question 5

Ciliary body

Answer 5

Contains ciliary muscles (an effector) that controls the curvatures of the lens.

Question 6

Suspensory
ligament

Answer 6

A connective tissue that attaches the edge of the lens to the ciliary body.

Question 7

Aqueous
chamber

Answer 7

Space between the lens and the cornea, filled with aqueous humour which
keeps the front of the eyeball firm and help refract light into the pupil.

Question 8

Vitreous
chamber

Answer 8

Space behind the lens, filled with vitreous humour which keeps the eyeball
firm and helps to refract light onto the retina.

Question 9

Optic nerve

Answer 9

Transmits signal from the retina to the brain. No photoreceptors in this area
of the retina where the optic nerve leaves (blind spot)