Unit VIII - Eye Flashcards Preview

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Flashcards in Unit VIII - Eye Deck (108)
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1

What structures of the eye are derived from the neuroectoderm of the forebrain?

Retina and pigmented structures

2

The lens and cornea are derived from what specific embryological layer?

Surface ectoderm

3

The fibrous coats (sclera) are derived from which specific embryological layer?

Neural crest mesenchyme

4

What is the term for the white part of the eye?

Sclera

5

What happens to the sclera if pressure inside the eye increases?

Shape is maintained due to its thick, dense, and firm structure

6

Does light pass through the sclera?

No, it is opaque

7

What things pass through the many tiny openings seen on the sclera?

Blood vessels and neurons

8

What attaches to the sclera?

Extraocular muscles

9

What is the term for the location where the sclera transitions into the cornea?

Limbus

10

What is the sclera continuous with posteriorly?

Fibrous sheath (made of arachnoid) that covers cranial nerve II

11

What lines the sclera anteriorly?

Conjunctiva

12

What part of the eye of transparent and clear?

Cornea

13

What is the primary structure of the eye used for focusing light?

Cornea

14

Is the cornea concave or convex anteriorly?

Convex

15

What layer of the cornea is continuous with the conjunctiva?

Corneal epithelium

16

What is the largest/thickest part of the cornea?

Substantia propria

17

What is the innermost layer of the cornea?

Endothelium

18

What does the endothelium of the retina line?

Iridocorneal layer

19

What are the layers of the cornea in order from outermost to innermost?

Corneal epithelium, anterior limiting lamina, substantia propria, posterior limiting lamina, endothelium

20

What makes up the fibrous tunic of the eye?

Sclera and cornea

21

What makes up the vascular tunic of the eye?

Choroid, ciliary body, and iris

22

Which tunic of the eye is the only complete layer?

Fibrous tunic (makes it all the way around the eye)

23

Which tunic of the eye has many blood vessels and lots of autonomic influence (especially sympathetic)?

Vascular tunic

24

What special effect may be possessed by the blood vessels that supply the vascular tunic of the eye?

Cooling effect

25

Where is the only location where the choroid is anchored to the sclera?

Where the optic nerve penetrates it

26

What is the choroid loosely attached to?

Sclera

27

What is the purpose of the dark pigment of the choroid?

Helps limit passage of light both through sclera to retina and through retina to sclera

28

What is the ciliary body continuous with?

Choroid (posteriorly)
Iris (anteriorly)

29

What structure is suspended by the ciliary body?

Lens

30

What is the substance produced by the ciliary body that is found in the anterior segment of the eye?

Aqueous fluid