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PT612 > Orbit > Flashcards

Orbit Flashcards

1
Q

bones of the orbit

A 
frontal
zygomatic
maxillary
ethmoid
lacrimal
sphenoid
palatine
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2
Q

apex of the orbit is the

A

optic canal located in the sphenoid bone

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3
Q

the superior orbital fissure is between the

A

greater and lesser wings of the sphenoid bone

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4
Q

inferior orbital fissue is between the

A

greater wing of the sphenoid and maxilla

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5
Q

medial wall of the orbit is made of

A 
ethmoid
lacrimal
maxillary
frontal
sphenoid
palatine
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6
Q

four rectus muscles originate from

A

a common tendonus ring in the post portion of the orbit

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7
Q

they insert into the

A

scerla of the anterior eyeball

posterior to the cornea

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8
Q

two oblique muscles insert on the

A

posterior lateral portion of the eyeball

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9
Q

superior oblique is from ______ to ______

A

from sphenoid to fibrous trochlea ring to sclera deep to superior rectus

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10
Q

inferior oblique originates from the

A

anterior floor of the orbit

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11
Q

it travels posterior and inserts onto the

A

sclera deep to the lateral rectus

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12
Q

Superior and interior rectus _____ the front of the eye

A

adducts

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13
Q

Superior and inferior oblique _____ the front of the eye

A

abducts

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14
Q

ABduction of the eye is

A

Superior oblique
lateral rectus
inferior oblique

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15
Q

ADDuction

A

Superior Rectus
Medial Rectus
Inferior Rectus

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16
Q

Elevation is

A

Superior rectus

Inferior oblique

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17
Q

Depression is

A

Inferior Rectus

Superior oblique

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18
Q

internal rotation can be accomplished by

A

superior rectus

superior oblique

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19
Q

External rotation can be accomplished by

A

inferior rectus

inferior oblique

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20
Q

Levator Palpebrea superiorism does what

innervated by:

A

raises upper eyelid

Oculomotor N.

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21
Q

Superior Tarsal inserts into:

A

tarsal plate of upper eyelid

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22
Q

Superior Tarsal is under _______ innervation

A

sympathetic innervation

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23
Q

Superior Tarsal causes eyelid to ________

A

open widely during fright

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24
Q

contents of the orbit

A 
eyeball
CN II
CN III
CN IV
CN VI
CN V1 
ocular muscles 
lacrimal gland
lacrimal duct and sac
ophthalmic artery
Ophthalmic vein
fat
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25
Q

Ophthalmic N. (V1) is

A

general sensory to the contents of orbit

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26
Q

branches of the V1

A

Frontal N.
Nasociliary N.
Lacrimal N.

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27
Q

Frontal N. gives off

A

Supraorbital and Supratrochlear N.

28
Q

Frontal N. is

A

sensory to skin on forehead

29
Q

Nasociliary N. gives off

A

long ciliary N.

Anterior Ethmodial N. that gives off external nasal

30
Q

Long Ciliary N. is

A

sensory to the eyeball

31
Q

Anterior Ethmoidal N. is

A

sensory to superoir nasal cavity

32
Q

Lacrimal N. is

A

sensory to lacrimal gland and lateral upper eyelid

33
Q

Oculomotor is motor to

A 
superior
medial 
inferior rectus
inferior oblique
levator palpebrea superioris m.
34
Q

Oculomotor is parasympathetic motor to _______ via

A

ciliary mm. and sphincter of pupil via Short Ciliary M.

35
Q

Sensory to the Eye is via

A

V1 nasociliary n. and long ciliary n.

36
Q

parasympathetic to the eye is

A

Oculomotor N. that synapse at ciliary gang then via short ciliary N. to sphincter of pupil and ciliary mm

37
Q

Sympathetic to the eye is via

A

sympathetic trunk and internal carotid plexus via long ciliary N.

38
Q

short ciliary N. to

A

sphincter of pupil and ciliary mm.

39
Q

long ciliary N. to

A

dilator of pupil

40
Q

Trochlear N. is motor to

A

superior oblique m

41
Q

Abducent N. is motor to

A

lateral rectus m.

42
Q

Inner Layer includes the

A

sclera and cornea

43
Q

sclera is t

A

the opaque fibrous covering 5/6 of eyeball

44
Q

cornea is

A

transparent fibrous anterior portion which allows light to pass through 70% of focusing light on retina

45
Q

Middle Layer includes the

A

Iris
Choroid
Ciliary Body

46
Q

Iris is the

A

thin contractile diaphragm on surface of lens

47
Q

the pupil is the

A

central apeture

48
Q

the Iris contains 2

A

smooth muscles

sphincter and dilator of pupil

49
Q

Choroid is the

A

vascular layer of eye

50
Q

Ciliary body contains

A

smooth muscle which change the shape of the lens

51
Q

ciliary body also secretes

A

aqueous humor

52
Q

the aqueous humor provides

A

nutrients & moisture to the lens and cornea

53
Q

The inner layer contains

A

retina

54
Q

the retina is the

A

light sensing portion

55
Q

retina is composed of

A

rods and cones

56
Q

macula is specialized for

A

visual acuity

57
Q

most acute vision and the most cones is

A

fovea centralis

58
Q

optic disc is where

A

the optic N. enters the eyeball

59
Q

the optic disc is ______ to light

A

insensitive

60
Q

interior of eyeball is filled with

A

vitreous humor enclosed in vitreous body

61
Q

anterior & posterior chambers are filled with

A

aqueous humor

62
Q

the aqueous humor is secreted into

A

posterior chamber

63
Q

it is absorbed into

A

scieral sinus of anterior chamber

64
Q

blockage of the sinus may lead to increased

A

intraocular pressure:

glaucoma

65
Q

Optic N. is an outgrowth of

A

brain covered with 3 meninges

66
Q

rods detect

A

light

67
Q

cones detect

A

color
red
green
blue

PT612 (9 decks)

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