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binocular vision > lecture 9 - EOM 2 > Flashcards

lecture 9 - EOM 2 Flashcards

1
Q

where do you look to see for a muscle weakness ?

A

you use the position where the muscle is maximally used

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2
Q

dextroversion means ..

A

right

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3
Q

laevoversion means..

A

left

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4
Q

in primary position which muscles are innervated?

A

all muscles are equally innervated

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5
Q

why is primary position not good for detecting a muscle weakness ?

A

each muscle only works by a small amount, therefore you would be unable to detect subtle weakness and you wouldn’t be ale to detect which muscle is causing the problem

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6
Q

what are the secondary positions?

A

direct elevation
direct depression
laevoversion
dextroversion

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7
Q

which muscles are maximally used in direct elevation

A

right & left:

Superior Rectus and inferior oblique

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8
Q

which muscles are maximally used in direct depression

A

right and left

inferior rectus and superior oblique

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9
Q

which muscle is maximally sed in laevoversion

A

right medial rectus
and
left lateral rectus

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10
Q

which muscle is maximally used in dextroversion

A

right lateral rectus

left medial rectus

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11
Q

if esotropic, which muscle is weak?

A

lateral rectus

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12
Q

if exotropic which muscle is weak?

A

medial rectus

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13
Q

what are the tertiary positions?

A

dextroelevation
dextrodepression
laevoelevation
laevodepression

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14
Q

which muscles are used maximally in dextroelevation

A

right Superior Rectus

left inferior oblique

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15
Q

which muscles are used maximally in dextrodepression

A

right inferior rectus and left superior oblique

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16
Q

which muscles are used maximally in laevoelevation

A

left Superior Rectus

right inferior oblique

17
Q

which muscles are used maximally in laevodepression

A

right superior oblique and left inferior rectus

18
Q

what is an agonist

A

the muscle that starts off a movement

19
Q

what is an antagonist

A

EOM who’s action opposes the contracting muscles

20
Q

contraction of the agonist produces …. in the antagonist

A

relaxation

21
Q

what is sherringtons law

A 
Whenever an agonist
receives an impulse to
contract, an equivalent
inhibitory input is sent
to its antagonist, which
relaxes and actually
lengthens.
22
Q

what do the MR and LR do on direction elevation/depression

A

move out of their plane of action
may contribute
or effect horizontal position by increasing abduction or adduction as the eye elevates or depresses

23
Q

if you tilt your head to your right shoulder what does the right eye do?

A

introits and slightly elevates

24
Q

what are the synergists in RE if you tilt your head to the right

A

RSR and RSO

25
Q

what are the direct antagonists in RE if you tilt your head to the right

A

RIR and RIO

26
Q

if you tilt your head to your right shoulder what does the left eye do?

A

extorts and slightly depresses

27
Q

what are the synergists in LE if you tilt your head to the right?

A

LIR and LIO

28
Q

what are the direct antagonists in LE if you tilt your head to the right ?

A

LSR and LSO

29
Q

if you tilt your head to your left shoulder what does the left eye do?

A

intorts and slightly elevates

30
Q

what are the synergists in LE if you tilt your head to the left

A

LSR and LSO

31
Q

what are the direct antagonists in LE if you tilt your head to the left

A

LIR & LIO

32
Q

what are the direct antagonists in RE if you tilt your head to the left ?

A

RSR & RSO

33
Q

what are the synergists in RE if you tilt your head to the rleftght?

A

RIR & RIO

34
Q

W hat action does the RSR mainly have when you carry out ocular motility on dextroelevation ?

A

elevation

35
Q

What action does the RSO mainly have when you carry out ocular motility on laevo depression?

A

depression

36
Q

What muscles will contract in the Right eye when you tilt your head to the Left?

A

Right inferior rectus, right inferior oblique

binocular vision (10 decks)

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