Layers of the Eye

Question 1

what is the limbus?

Answer 1

corneoscleral junction

Question 2

what covers the sclera?

Answer 2

conjunctiva

Question 3

what is the conjunctival fornix?

Answer 3

junction between the conjunctiva and the lower eyelid

Question 4

what is the iris and what is its role?

Answer 4

a thin diaphragm that controls the size of the pupil (an opening in the iris)

Question 5

what covers the iris?

Answer 5

cornea

Question 6

what are the three layers of the eye?

Answer 6

fibrous (outer layer)
uvea (vascular/middle layer)
retina (photosensitive/inner layer)

Question 7

what does the fibrous outer layer of the eye consist of?

Answer 7

sclera and cornea

Question 8

what does the uvea layer consist of?

Answer 8

iris
ciliary body
choroid

Question 9

what does the retina consist of?

Answer 9

back of the eye with rod and cone cells

Question 10

what are the two segments of the eye?

Answer 10

anterior segment

posterior segment

Question 11

where is the anterior segment of the eye?

Answer 11

in front of the lens

Question 12

what are the two chambers of the anterior segment?

Answer 12

anterior chamber: between cornea and iris

posterior chamber: between iris and suspensory ligaments

Question 13

where is the posterior segment of the eye?

Answer 13

behind the lens

Question 14

what does the posterior segment of the eye contain?

Answer 14

vitreous body that secretes vitreous humour that is mainly water with protein (collagen)

Question 15

what can the collagen do in the posterior segment?

Answer 15

it can clump together to form floaters

Question 16

where is the aqueous humour found?

Answer 16

between cornea and lens

Question 17

where is the vitreous humour found?

Answer 17

between lens and the retina

Question 18

what is the ciliary body made up of?

Answer 18

smooth muscle and blood vessels with ciliary processes

Question 19

role of the ciliary processes in the ciliary body?

Answer 19

secrete aqueous which circulates in the posterior chamber nourishing the lens before passing through the pupil to the anterior chamber and nourishing the cornea

Question 20

where is the aqueous humour reabsorbed?

Answer 20

into the scleral venous sinus (Canal of Schlemm) at the iridocorneal angle

Question 21

why is the aqueous humour needed?

Answer 21

it nourishes avascular structures