ch. 15 17 Flashcards Preview

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Flashcards in ch. 15 17 Deck (143)
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61

has no blood vessels and is quite sensitive (many free nerve endings)

cornea

62

fx. is window of eye and helps focus entering light rays

cornea

63

choroid
colliery body
suspensory ligaments
iris
pupil

vascular layer

64

vascular layer between sclera and retina

choroid

65

many capillaries to deliver o2 and nutrients to retina

choroid

66

forms inner ring around front of eye

ciliary body

67

secretes aqueous humor

ciliary body

68

extend inward from cilia body

suspensory ligaments

69

fx. holds lens in place

suspensory ligaments

70

colored portion of eye that contains 2 layers of smooth muscle

iris

71

fx. control light intensity entering eye

iris

72

central opening of iris that changes sizes via iris muscle

pupil

73

fx. opening that light passes through as it enters eye

pupil

74

inner lining of eyeball and has two layers

retina

75

what are the two layers of the retina

outermost- pigmented (absorbs light)
inner- contains photoreceptors

76

why is the fovea the site of the sharpest vision

contains no rods and very increase of cones

77

where is the blind spot located

optic disk (optic nerve head)

78

why do we have a blind spot

no receptor cells

79

origin of optic nerve in back of eye

optic disc

80

2 cavities in the eye

anterior and posterior cavity

81

between cornea and lens and is filled with aqueous humor

anterior cavity

82

nourishes cornea and lens
forms fluid cushion
maintains shape of front of eye

fx of anterior cavity

83

interior or eyeball that is filled with vitreous humor

posterior cavity

84

fx. stabilizes shape of eye

posterior cavity

85

transparent and elastic

lens

86

fx. focus visual images on the photoreceptors via changing shape (accommodation)

lens

87

focus visual images on the photoreceptors via changing shape

accommodation

88

lens rounder

nearby objects

89

lens flattened

distant objects

90

lens loses transparency and becomes cloudy and opaque

cataract