Anatomy of the Eye Flashcards Preview

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

Flashcards in Anatomy of the Eye Deck (48)
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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