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binocular vision > lecture 8 - EOM > Flashcards

lecture 8 - EOM Flashcards

(62 cards)

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1
Q

how many EOM per eye

A

7

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2
Q

name the muscle that controls the eyelid

A

levator palpebrae superioris

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3
Q

which cranial nerve supplies the:
Superior Rectus
LPS

A

3rd (cranial) - superior divison

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4
Q

which cranial nerve supplies the:
medial rectus
inferior rectus
inferior oblique

A

3rd (cranial) - inferior division

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5
Q

which cranial nerve supplies the superior oblique

A

4th (trochlear)

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6
Q

which cranial nerve supplies the lateral rectus

A

6th (abducens)

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7
Q

what is the anatomical origin of the recti muscles?

A

annulus of Zinn

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8
Q

where is the mechanical origin of the recti muscles?

A

10mm posterior to the equator of globe

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9
Q

as the muscle contracts, the cornea rotates …. the body of the muscle itself
(fill in the gap)

A

towards

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10
Q

what is the primary action of the medial rectus?

A

inwards

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11
Q

what is the primary action of the lateral rectus?

A

outwards

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12
Q

what is the primary action of the Superior Rectus?

A

upwards

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13
Q

what is the primary action of the inferior rectus?

A

downwards

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14
Q

what is the anatomical origin of superior oblique

A

annulus of zinn

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15
Q

what is the anatomical origin of inferior oblique

A

anterior infero-nasal corner

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16
Q

where is the mechanical origin superior oblique?

A

anterior supero-nasal corner of orbital rim

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17
Q

where is the mechanical origin of the inferior oblique ?

A

anterior and inferior to globe, copies to IR tendon

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18
Q

what is the primary action of superior oblique

A

the cornea moves away from the body of the muscle therefore

downwards

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19
Q

what is the primary action of the inferior oblique?

A

the cornea moves away from the body of the muscle and therefore

upwards

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20
Q

downwards movement is known as

A

depression

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21
Q

upwards movement is known as

A

elevation

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22
Q

which 2 recti are concentric with limbus

A

MR and LR

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23
Q

which 2 recti are tilted slightly nasally

A

SR and IR

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24
Q

list the insertions of the muscles, starting with closest to limbus to furthest

A

MR (5.5mm away)
IR (6.5mm)
LR (7mm)
SR (7.5mm)

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25
which muscle inserts underneath the LR
IO
26
which muscle inserts under the SR
SO
27
in primary position where is the centre of rotation location in relation to the apex of the cornea?
13.5mm
28
if the eye is abducting and adducting, which of Fick's axis is the eye moving alone?
Z axis
29
if the eye is elevating or depression, which of Fick's axis is the eye moving along?
X axis
30
if the eye is cycle-rotating or displaying torsion, which of Fick's axis is the eye moving along?
Y axis
31
what is duction movements limited by?
length of muscle + tendon edge of orbit soft tissue of orbit
32
what movement is adduction
inwards
33
what movement is abduction?
outwards
34
what is elevation known as (in terms of duction)
supraduction
35
what is depression known as (in terms of duction)
infraduction
36
what is extorsion known as (in terms of duction)
excycloduction
37
what is intorsion known as (in terms of duction)
incycloduction
38
where does the muscle contract if it's axis of rotation coincides with one of Fick's axes of rotation?
purely around that axis
39
where is a muscles axis of rotation in terms of its muscle plane?
perpendicular
40
what is the muscle plane?
point where the muscle first touches the globe and the centre of rotation
41
what does RADSIN stand for?
R - recti AD - adduct S - superiors IN - intort
42
in primary position does the Superior Rectus muscles axis coincide with one of ticks axes ?
no
43
what is the primary action of the superior rectus
elevation
44
what is the secondary action of the Superior Rectus
incycloduction
45
what is the tertiary action of the Superior Rectus?
adduction
46
what is the primary action of the inferior rectis?
depression
47
what is the secondary action of the inferior rectus?
excycloduction
48
what is the tertiary action of the inferior rectus?
adduction
49
which muscles form angles of about 23 degrees with x axis and 67 degrees with y axis
SR | IR
50
which muscles form angles of about 36 degrees with the y axis and 54 degrees with the x axis ?
SO
51
what is the primary action of superior oblique?
incycloduction
52
what is the secondary action of superior oblique?
depression
53
what is the tertiary action of the superior oblique?
abduction
54
what is the tertiary action of the superior oblique?
abduction
55
when the eye is adducted which muscle produces depression?
superior oblique
56
when the eye is adducted which muscles produces elevation?
inferior oblique
57
when the eye is abducted which muscle produces elevation?
superior rectus
58
when the eye is abducted which muscle produces depression?
inferior rectus
59
what actions does the SR have in primary position?
elevation adduction intorsion
60
what deviation in primary position would your px have if they had a large right SR weakness?
right hypotropia right exotropia right extorsion
61
what action does the inferior oblique have in primary position?
extorsion elevation abduction
62
what deviation in primary position would your px have if they had a large right IO weakness?
left hypotropic left intorsion left esotropia

binocular vision (10 decks)

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