Eye Flashcards Preview

Anatomy > Eye > Flashcards

Flashcards in Eye Deck (23):
1

What is the anterior chamber filled with?

Aqueous humor

2

What is the conjunctiva?

Mucous membrane that covers front of eye and lines eyelids

3

What are the functions of the conjunctiva?

Lubricates eye
Immune surveillance - prevents microbe entry

4

What is the function of the sclera?

Protect the eye

5

What is the function of the iris?

Control the diameter of the pupil - amount of light that reaches retina

6

What is the nerve supply to circular muscle of iris?

Short ciliary nerves

7

Which cranial nerve do the short ciliary nerves travel along?

Oculomotor

8

What is the nerve supply to the radial muscle of iris?

Long ciliary nerves

9

Which cranial nerve do the long ciliary nerves travel along?

Opthalmic

10

What nerve supplies the ciliary muscle in the ciliary body?

Short ciliary nerve

11

How does contraction of ciliary body affect vision?

Short range focus - lens more spherical

12

How is the aqueous humor reabsorbed?

Anterior chamber -> trabecular network -> Schlemm's canal -> episcleral veins

13

Which eye disease is associated with problems of aqueous humor drainage?

Glaucoma

14

What is the function of the choroid layer of the eye?

Provides oxygen/nourishment to outer layers of retina, limits uncontrolled reflection in eye

15

What two layers is the retina made up of?

Outer pigment layer
Multi-layered neural retina

16

What are the three main differences between the function of rods and cones?

Rods:
- Dim light
- Perceive flicker well
- Low acuity
Cones:
- Bright light
- Less response to flicker
- High acuity

17

What is the blind spot called?

Optic disc/papilla

18

Why is the blind spot blind?

No photoreceptors

19

What is the macula lutea?

Yellow pigmented zone

20

What is the fovea?

Centre of the macula lutea that's specialised for visual acuity

21

How is the fovea specialised?

Only contains cones, no blood vessels to distort image

22

Which layers of the retina does the uveal circulation supply?

Outer and middle layers of retina

23

Which layer of the retina does the retinal circulation supply?

Inner layer of retina