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binocular vision > lecture 8 - EOM > Flashcards

lecture 8 - EOM Flashcards

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
Q

which muscle inserts underneath the LR

A

IO

26
Q

which muscle inserts under the SR

A

SO

27
Q

in primary position where is the centre of rotation location in relation to the apex of the cornea?

A

13.5mm

28
Q

if the eye is abducting and adducting, which of Fick’s axis is the eye moving alone?

A

Z axis

29
Q

if the eye is elevating or depression, which of Fick’s axis is the eye moving along?

A

X axis

30
Q

if the eye is cycle-rotating or displaying torsion, which of Fick’s axis is the eye moving along?

A

Y axis

31
Q

what is duction movements limited by?

A

length of muscle + tendon
edge of orbit
soft tissue of orbit

32
Q

what movement is adduction

A

inwards

33
Q

what movement is abduction?

A

outwards

34
Q

what is elevation known as (in terms of duction)

A

supraduction

35
Q

what is depression known as (in terms of duction)

A

infraduction

36
Q

what is extorsion known as (in terms of duction)

A

excycloduction

37
Q

what is intorsion known as (in terms of duction)

A

incycloduction

38
Q

where does the muscle contract if it’s axis of rotation coincides with one of Fick’s axes of rotation?

A

purely around that axis

39
Q

where is a muscles axis of rotation in terms of its muscle plane?

A

perpendicular

40
Q

what is the muscle plane?

A

point where the muscle first touches the globe and the centre of rotation

41
Q

what does RADSIN stand for?

A

R - recti
AD - adduct
S - superiors
IN - intort

42
Q

in primary position does the Superior Rectus muscles axis coincide with one of ticks axes ?

A

no

43
Q

what is the primary action of the superior rectus

A

elevation

44
Q

what is the secondary action of the Superior Rectus

A

incycloduction

45
Q

what is the tertiary action of the Superior Rectus?

A

adduction

46
Q

what is the primary action of the inferior rectis?

A

depression

47
Q

what is the secondary action of the inferior rectus?

A

excycloduction

48
Q

what is the tertiary action of the inferior rectus?

A

adduction

49
Q

which muscles form angles of about 23 degrees with x axis and 67 degrees with y axis

A

SR

IR

50
Q

which muscles form angles of about 36 degrees with the y axis and 54 degrees with the x axis ?

A

SO

51
Q

what is the primary action of superior oblique?

A

incycloduction

52
Q

what is the secondary action of superior oblique?

A

depression

53
Q

what is the tertiary action of the superior oblique?

A

abduction

54
Q

what is the tertiary action of the superior oblique?

A

abduction

55
Q

when the eye is adducted which muscle produces depression?

A

superior oblique

56
Q

when the eye is adducted which muscles produces elevation?

A

inferior oblique

57
Q

when the eye is abducted which muscle produces elevation?

A

superior rectus

58
Q

when the eye is abducted which muscle produces depression?

A

inferior rectus

59
Q

what actions does the SR have in primary position?

A

elevation
adduction
intorsion

60
Q

what deviation in primary position would your px have if they had a large right SR weakness?

A

right hypotropia
right exotropia
right extorsion

61
Q

what action does the inferior oblique have in primary position?

A

extorsion
elevation
abduction

62
Q

what deviation in primary position would your px have if they had a large right IO weakness?

A

left hypotropic
left intorsion
left esotropia

binocular vision (10 decks)

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