Anatomy of the Eye Flashcards Preview

Hugh's MD1 Neuro > Anatomy of the Eye > Flashcards

Flashcards in Anatomy of the Eye Deck (48):
1

Which wall and bones are commonly fractured?

The medial wall

Sphenoid 

Lacrimal

1

What is the function of the cornea?

Bends light - refracting it

1

What is the choroid?

A layer of blood vessels beneath the retina

2

What happens if you lose the corneal endothelium?

It doesn't come back (those cells don't divide)

Eye swells - v. painful

2

Which muscle elevates the eyelid?

Levator palpebrae superiosis

4

How does the entry of the optic nerve appear?

White disk

5

Which arm of the NS innervates sphincter pupillae?

Parasympathetic

 

6

Which muscles control the aperture of the eye?

Spincter papillae: constricts the pupil

 

Dilator papillae: dilates the pupil

7

What causes presbyopia?

The lens looses flexibility

9

Which bones make up the lateral aspect of the orbit?

Zygomatic

Greater wing of the sphenoid

9

What are zonules?

Ligaments that tether the lens to the ciliary processes

9

Which muscle closes the upper lid?

Orbicularis oculi

10

Describe the course of flow of the aqueous humour

It is produced by the ciliary epithelium

Travels through the pupil

Drain via the anterior chamber angle into the venous system

11

What layer do extraocular muscles attachment to the eye?

The sclera

12

What is the lamina cribosa?

Fibres of the sclera that pass over the optic nerve in a mesh like pattern

13

What are the names of the ciliary arteries?

Long posterior ciliary artery

Short posterior ciliary artery

Anterior ciliary artery

14

Which branch of the NS innervates the ciliary muscles?

Parasympathetic

15

What are the layers of the cornea?

Epithelium

Bowman's layer

Stroma

Descemet's membrane

Endothelium

16

What is the function of the endothelium of the cornea?

The maintain fluid balance

17

What are the functions of the ciliary body?

Produce aqueous humour

Tether the lens

House the ciliary muscle

18

Does the fovea have rods?

Nah

19

Why is the cornea transparent?

Because the collagen is laid out in a very ordered manner

20

What is the most important role of the ciliary epithelium?

Produce aqueous humour

21

What is the optic nerve formed by?

Axons of ganglion cells

21

How can the eyelids be described?

Transition zone between conjunctiva and skin

23

What does the ciliary muscle do?

Allows focusing via the lens

24

What happens if the corneal epithelium is damaged?

It heals v. rapidly

26

Describe the dual blood supply of the retina?

Central retinal artery supplies the inner layer of the retina while the posterior ciliary artery supplies the outer layer of the retina

27

How are the cornea and sclera arranged in relation with each other?

They are continuous

28

When the ciliary muscles are contracted, at what distance can you focus?

Close up

29

Why is the sclera so hard?

The whirls of collagen provide strength

30

Which CN controls levator palpebrae superiosis

CNIII

32

Which CN innervates orbicularis oculi?

CNVII

33

What forms the outer layer of the eye?

Cornea

Sclera

34

What is the sequence of branching that leads to the central retinal artery

Internal carotid > Ophthalmic artery > Central retinal artery

35

What type of muscle is the ciliary muscle?

Smooth muscle

36

Which bones make up the medial aspect of the orbit?

Maxilla

Lacrimal

Body of the sphenoid

Ethmoid

37

Which bones make up the roof of the orbit?

Frontal

Lesser wing of the sphenoid

38

Which bones make up the floor of the orbit?

Maxilla

Zygomatic

Palantine

39

What is the fovea?

Specialised region for central vision

- has the highest density of cones

40

The structure that contains colour is called what?

The iris

41

Which arm of the NS innervates dilator papillae?

Sympathetic NS

42

Does the cornea have a direct vascular supply?

Nah, avascular

44

What is the function of the retina?

Light detection and translation

45

What is presbyopia?

The loss of accommodation (the ability to focus) with age

46

What makes up the second layer of the eye, aka uvea?

Iris

Ciliary body

Choroid

47

Which bones form the infraorbital margin of the orbit?

The maxilla medially

The zygomatic bone laterally

48

What occurs at the anterior chamber angle?

Meeting point of the cornea and iris

- aqueous humour drains there