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Flashcards in Structure of the Eye Deck (31)
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1

What are the three coats of the eye

Fibrous
Vascular
Sensory

2

What makes up fibroid coat

Cornea
Sclera
All made up of collagen

3

What is the cornea

Transparent coat over front of eye
Joints to form sclera = opaque

4

What is cornea layers

Epithelium
- Regenerates fast so if scratch will fix in a few days
Bowman's basement membrane
Stroma - regular collagen
Desment
Endothelium

5

What epithelium

Stratified squamous
Non-keratanised

6

Does cornea have blood vessel

No vessels in storma layer to maintain transparency
Makes corneal graft successful

7

What parts of cornea heal with or without scar

BM = without
Stroma = with

8

What is behind endothelium

AH
Provides nutrition as no blood vessels
Also nutrition via tear film and sclera

9

What makes up the vascular coat

Iris
Ciliary body
Choroid

10

What is choroid

Vascular layer

11

Where is the iris

Between lens and cornea
Hangs from sclera

12

What is the aperture in the middle of iris

Pupil
Controls how much light enters

13

What is the ciliary body

Behind iris
Suspends the lens via ciliary ligaments

14

What is infront and behind the lens

Infront = AH
Behind= VH

15

What is the sensory coat

Retina
Optic nerve

16

LOOK AT PHOTO

OK

17

What are the layers of the retina an function

Pigment epithelial layer sits on top of choroid
Layer of rod and cones - photoreceptors
Nerve fibre
Inner layer

Retina is responsible for converting light -> neurological signal via photoreceptor cells

18

What supplies retina

Outer layers = choroid
Inner = central retinal artery - branch of ICA

19

What are barriers in the eye

Blood aqueous
Blood retinal - prevents capillaries from choroid entering retina

20

What is anterior segment of eye

Infront of lens
Anterior chamber - in front of iris
Posterior - behind iris where AH is produced

21

What is posterior segment of the eye

Behind lens
Contains VH

22

What is AH produced from and how does it flow

Ciliary body
Flows into posterior chamber of anterior segment
Flows through pupil into anterir
Travels through trabeculae meshwork
Drains into Schlemm's canal at cornea sclera junction
Drains out of eye at angle of anterior chamber into episcleral veins

23

What is upper and lower eyelid made up of

Skin
Muscle
Connective tissue
Mucous membrane

24

What does skin contain

Hair follicles
Sebaceous glands which can get blocked

25

What muscles

LPS - opens
Orbicularis oculi - closes
Meconium gland - oil

26

What does mucous membrane do

Secretes conjunctiva which liners eyelid and sclera
NOT cornea

27

What is lacrimal apparatus

Tears come from lacrimal gland
Coat conjunctivae
Drain out of medial eye into lacrimal duct
Join into nasolacrimal duct

28

What stimulates lacrimal apparatus

Parasympathetic from facial

29

What is function of tear film

Keep cornea moist
Wash away foreign body
Ab to kill microbes

30

What are 3 layers

Mucous - conjunctivae
Aquesous - lacrimal gland
Oil - meconium gland