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SP16 Anatomy Exam 2 > Orbit & Eye > Flashcards

Flashcards in Orbit & Eye Deck (113):
1

what are the 4 features of the eyelid

palpebral conjuctiva
bulbar conjuctiva
conjuctival sac
fornices

2

where is the palpebral conjuctiva

membrane lining inner eyelid

3

where is the bulbar conjuctiva

membrane lining surface of eye

4

where is the conjuctival sac

potential space between these membranes

5

where is the fornices

conjuctival reflections from eyelid to eye

6

what provides form for eyelids?

superior and inferior tarsus

7

what sebaceous glands are seen through conjuctiva

tarsal glands

8

what tendon does CN III innervate

levator palperae superioris muscle

9

what are the bones of the orbit

frontal
sphenoid
ethmoid
palatine
lacrimal
maxillary
zygomatic

10

what arteries go through the anterior and posterior ethmoidal foramen

anterior and posterior ethmoidal arteries

11

Objects piercing roof enter ___

anterior cranial fossa

12

Objects piercing floor enter ?

maxillary sinus

13

Objects piercing medial wall enter ?

ethmoid air cells

14

Objects piercing lateral wall enter ?

temporal fossa

15

Objects piercing superior orbital fissure enter ?

middle cranial fossa

16

what is the floor of the orbit?

roof of maxillary sinus

17

what does a medial orbital wall injury affect?

ethmoidal air cells

18

what does a lateral orbital wall injury affect?

temporal fossa

19

what goes through the optic canal

CN II and opthalamic artery

20

what goes through the superior orbital fissure?

CN III, IV, V1, VI, and opthalamic vv

21

what goes through the supraorbital notch/foramen

supraorbital n (CN V1) & a

22

what goes through the inferior orbital fissure?

infraorbital and zygomatic n (CN V2) and a

23

what goes through the infraorbital foramen

infraorbital n (CN V2) and a

24

what goes through the anterior ethmoidal foramen?

anterior ethmoidal n and a (CNv1)

25

what goes through the posterior ethmoidal foramen?

posterior ethmoidal n (CNv1) and a

26

what goes through the foramen rotundum

maxillary nerve

27

what are the features of the external eye

conjuctiva
sclera
cornea

28

define conjuctiva

mucous membrane of eye and lids

29

define sclera

posterior 5/6 of outer layer (white part)

30

define cornea

anterior 1/6 of outer layer (transparent)

31

what are the 4 features of the middle eye

choroid
ciliary body
iris
pupil

32

define choroid

thin middle layer of ciliary aa & vorticose vv

33

define cilary body

smooth muscle around lens for accommodation

34

what controls focal point of lens?

ciliary body

35

define iris

colored smooth muscle behind cornea controlling pupil size

36

define pupil

adjustable aperture through which light enters eye

37

how does the ciliary body muscles affect the zonular fibers?

change the tension of the zonular fibers, change the focus of the lens

38

what are the 4 features of the internal eye

retina
macula lutea
fovea centralis
optic disc

39

define retina

neural layer of eye which receives a light rays

40

define macula lutea

oval region of retina for visual acuity

41

defina fovea centralis

most acute vision site at center of macula

42

define optic disc

regions where CN II and retinal vessels enter/exit

43

what represents a blind spot?

optic disc (no photo receptors)

44

why is the optic disc considered a blind spot?

no photoreceptors

45

T/F vessels are over the fovea centralis

False

46

how do the meningeal layers extend to the eye?

through the optic nerve

47

what are the 4 features of the refractive media of the eye

cornea
lens
aqueous humor
vitreous humor

48

define cornea

largely responsible for refraction of light in the eye

49

define lens

focuses light rays & near or distant objects on retina

50

define aqueous humor

watery filling anterior to lens

51

define vitreous humor (body)

gelatinous filling posterior to lens

52

what is the nervous "visual" layer

refractive media

53

what are the 4 features of the lacrimal apparatus

lacrimal gland
lacrimal canaliculi
lacrimal sac
nasolacrimal duct

54

whats is lacrimal gland function?

produces lacrimal fluid (tears), flows inferomedially

55

what is the lacrimal canaliculi function

transports tears to lacrimal sac

56

what is lacrimal sac function

drains tears to nasolacrimal duct

57

what is nasolacrimal duct

drains tears through nasolacrimal canal (under inferior nasal concha)

58

levator palpebrae superioris m action?

raises upper eyelid

59

superior rectus m action?

elevates and adducts eye
rotates eye medially

60

inferior rectus m action?

depresses and adducts eye
rotates eye laterally

61

lateral rectus m action?

abducts eye

62

medial rectus m action?

adducts eye

63

superior oblique m action

depresses and abducts eye

64

inferior oblique m action?

elevates and abducts eye

65

which muscle helps the eye look "down and out"

superior oblique m

66

what tendon is oriented with superior oblique m?

trochlea

67

which muscle makes the eye look up and out?

inferior oblique m

68

which muscles ABDUCT the eye?

obliques

69

which muscles ADDUCT the eye?

recti

70

which cranial nerve supplies superior oblique m

CN IV

71

which muscles does the CN III supply?

LPS
SR
MR
IR
IO

72

which cranial nerve supplies lateral rectus m?

CN VI

73

which cranial nerve carries p-symp to ciliary ganglion?

CN III

74

how can the eye be placed to test lateral and medial rectus mm?

neutrally

75

how can the eye be placed to test superior and inferior rectus mm?

abducted

76

how can the eye be placed to test superior and inferior oblique mm?

adducted

77

the position of ab/adduction is ____ of muscle action

opposite

78

what is the optic nerve sensory for?

special sense of sight

79

where are the optic nerve fibers?

between the eye and chiasm

80

what is the optic chiasm

intermingling of nerve fibers

81

what is the optic tract

nerve fibers from chiasm to brain

82

what are the two visual fields of the optic pathway

temporal
nasal

83

which visual field crosses over the chiasm?

temporal vision

84

which visual field remains ipsilateral?

nasal vision

85

what does visual field testing detect?

blindness

86

what does the optic nerve lesion result in?

total blindness in affected eye

87

what does the optic chiasm lesion produce?

loss of peripheral vision

88

what does the optic tract lesion result in?

ipsilateral nasal visual field loss and contralateral temporal field loss

89

pattern of optic tract lesion is due to ____ of ____ visual fields

crossing of temporal visual fields

90

what does the ciliary ganglion receive?

p-symp from CN III

91

what does the ciliary ganglion supply?

p-symps to ciliary muscle and pupillary sphincter muscle

92

what does pupillary dilator muscle receive?

sympathetics from internal carotid plexus

93

where are the preganglionic sympathetic cell bodies?

T1

94

what does the pupillary light reflex test?

CN II and CN III

95

how do we tell if there is a CN III p-symp lesion?

pupil remains dilated

96

what are the 3 divisions of the CN V1

"NFL"
Nasociliary n
Frontal n
Lacrimal n

97

what does the nasociliary n contain?

ethmoidal and infratrochlear nn
long ciliary nn (sensory and symp) to posterior eye

98

what does the frontal n branch to?

supraorbital and supratrochlear nn

99

what does the lacrimal n supply?

lacrimal gland and conjuctiva

100

what are the 7 arteries of the orbit and eye

ophthalmic a
posterior ciliary aa
central retinal a
ethmoidal aa
supraorbital a
supratrochlear a
lacrimal a

101

what does the ophthalmic a give rise to?

all arteries of the eye

102

what does the posterior ciliary aa supply?

outer and middle layers of the eye

103

what does the central retinal a supply?

inner layer of retina

104

what does the ethmoidal a supply

anterior cranial fossa, nose, and sinuses

105

what does the supraorbital a supply

central region of forehead

106

what does the supratrochlear a supply

medial region of forehead

107

what does lacrimal a supply

lacrimal gland

108

what are the 4 veins of the orbit and eye

superior ophthalmic v
inferior ophthalmic v
central retinal v
vorticose vv

109

what does the vorticose vv drain into?

superior and inferior opthalmic vv

110

where does central retina v drain?

cavernous sinus

111

what does the inferior ophthalmic v anastomose with and drain to?

anastomose with facial v and drain to cavernous sinus

112

what layer does the vorticose veins drain?

choroid layer

113

what layer does the central veins drain?

the retinal layer