Eye and Orbit 1

Question 1

3 layers of eye

Answer 1

fibrous, visceral and retina

Question 2

two components of fibrous layer

Answer 2

sclera and cornea

Question 3

what makes the sclera white but the cornea transparent

Answer 3

collagen fibres in both are arranged differently. Much more regular in the cornea

Question 4

what structures attach to the sclera

Answer 4

muscles of eye movement

Question 5

three components of vascular layer

Answer 5

choroid, ciliary bodies and iris

Question 6

how layers within the retina

Answer 6

10

Question 7

purpose of choroid

Answer 7

supply blood to the outer layers of the retina

Question 8

functions of ciliary body

Answer 8

contains muscles which contract to pull on zonules and stretch and thin the crystalline lens, focusing the eye.
it also produces the aqueous humor

Question 9

where is the aqueous humor

Answer 9

sits in front of the lens

Question 10

what are the zonules also often known as

Answer 10

suspensory ligament of the eye

Question 11

function of iris

Answer 11

control of pupil radius i.e. how much light gets into the eye

Question 12

gel of posterior segment of the eye (behind lens)

Answer 12

vitreous humor

Question 13

what maintains intraocular pressure

Answer 13

constant drainage and production of aqueous humor

Question 14

subdivisions of anterior segment

Answer 14

anterior chamber - in front of iris

posterior chamber - behind iris but in front of lens

Question 15

where does the aqueous humor drain out of the eye

Answer 15

in the angle of the anterior chamber into the trabecular meshwork leading to Schlemm’s canal then to episcleral veins