The Eye

Question 1

3 eyeball layers?

Answer 1

fibrous
vascular
sensory

Question 2

fibrous coat?

Answer 2

sclera and cornea

Question 3

vascular coat?

Answer 3

choroid supplies outer layer with blood
ciliary body suspends lens and produces aqueous humour
iris which controls the diameter of the pupil

Question 4

sensory coat?

Answer 4

retina with light sensitive rods and cones

Question 5

length of eyeball?

orbit?

Answer 5

24mm

40mm

Question 6

What is in anterior segment and what is it’s path?

Answer 6

Aqueous humor infront of the lens which aids to maintain IOP

It drains via the trabecular meshwork into the Schlemm’s canal

Question 7

what is posterior to lens?

Answer 7

Vitreous humor which helps to cushion the retina

Question 8

what muscle in eyelids?

what plate?

Answer 8

levator palpebrae superioris

hardplate (tarsal plate)

Question 9

what is the lacrimal apparatus?

Answer 9

the lacrimal gland is in the orbit laterally and opens into the conjunctival sac spending evenly over the cornea with each blink

tears drain through punctae which drains into lacrimal sac over the lacrimal bone and into nasolacrimal duct

Question 10

2 intrinsic muscles?

CN?

Answer 10

ciliaris muscle and constrictor pupillae

parasympathetic CN III

Question 11

where do recti muscles arise?

Answer 11

apex of the orbit from annular fibrous ring

Question 12

SO rise?

Answer 12

roof of the orbit posteriorly

Question 13

IO rise?

Answer 13

floor of the orbit anteriorly

Question 14

arterial supply to orbit?

Answer 14

ophthalmic artery a large branch of the ICA and supplies all structures in the orbit

Question 15

artery in optic nerve?

Answer 15

central retinal artery travels within substance of optic nerve and supplies inner layers of the retina

Question 16

venous drainage?

Answer 16

through ophthalmic veins which are superior and inferior and drain into the cavernous sinus