Unit VIII - Eye Flashcards Preview

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Flashcards in Unit VIII - Eye Deck (108)
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31

What divides the eye into general anterior and posterior segments?

Lens

32

What divides the anterior segment of the eye into anterior and posterior chambers?

Iris

33

What else can the ciliary body produce besides the aqueous fluid seen in the anterior segment of the eye?

Glycosaminoglycans of the vitreous body

34

What contains the ciliary muscle?

Ciliary body

35

What is the action of the ciliary muscle?

Contraction makes lens more convex to allow for nearer vision

36

What is the colored part of the eye?

Iris

37

What is the range of colors seen of the iris?

Light blue to dark brown

38

What two muscles make up the iris?

Sphincter pupillae and dilator pupillae

39

Which muscle of the iris contains fibers that are circumferentially oriented to constrict the pupil?

Sphincter pupillae

40

What part of the autonomic nervous system innervates the sphincter pupillae muscle?

Parasympathetic fibers

41

Which muscle of the iris has radially arranged fibers that cause the pupil to enlarge when contracted?

Dilator pupillae

42

The eye is derived from what embryological layer?

Ectoderm

43

What is another name for the retina?

Nervous tunic

44

What does the retina contact externally?

Choroid

45

What does the retina contact internally?

Vitreous body

46

How many layers of the retina are there?

10

47

What is another term for the pigmented layer of the retina?

Cementing layer

48

What layer of the retina is involved in a detached retina?

Cementing layer (pigmented layer)

49

What kinds of cells are found in the inner nuclear layer?

Bipolar cells

50

What kinds of cells are found in the nerve fiber layer?

Ganglion cell axons

51

What are the five cells involved in the vision pathway?

Photoreceptors --> inner nuclear layer (bipolar) cells --> ganglionic layer cells --> lateral geniculate body --> Brodmann area 17

52

What area of the eye is involved with the blind spot?

Optic disc

53

What is the point at which the optic nerve attaches to the eyeball?

Optic disc

54

To which side does the optic disc deviate?

Nasal side

55

What color does the optic disc appear?

White or yellowish

56

Are photoreceptors present in the optic disc?

No; no vision occurs here

57

Where do major blood vessels enter the eyeball?

Optic disc

58

What is located at the very center of the eye?

Macula lutea

59

The macula lutea is the darker area in the center of what structure?

Fundus

60

What is located in the middle of the maculae lutea?

Fovea centralis