Week 8: Extraocular Movements Flashcards

1
Q

LR6

A

Lateral Rectus innervated by CN VI (Abducens)

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2
Q

SO4

A

Superior Oblique innervated by CN IV (Trochlear)

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3
Q

ATR3

A

All the rest innervated by CN III (oculomotor)

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4
Q

Anatomical function of Lateral Rectus

A

abduction (the strong abductor)

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5
Q

Anatomical function of Medial Rectus

A

adduction

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6
Q

Anatomical function of Superior Rectus

A

elevation and adduction

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7
Q

Anatomical function of Inferior Rectus

A

depression and adduction

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8
Q

Anatomical function of Superior Oblique

A

depression and abduction

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9
Q

Anatomical function of Inferior Oblique

A

elevation and abduction

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10
Q

Muscles that help adduct the eye

A

MR, SR, and IR

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11
Q

Muscles that help abduct the eye

A

LR, SO, and IO

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12
Q

Muscles the help elevate the eye

A

SR and IO

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13
Q

Muscles the help depress the eye

A

IR and SO

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14
Q

2 axes of rotation for eye

A
  • horizontal: elevate and depress

* vertical: abduction and adduction

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15
Q

How to test the Lateral Rectus

A

look lateral

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16
Q

How to test the Medial Rectus

A

look medial

17
Q

How to test the Superior Rectus

A

look lateral, then up

lateral opposes the adduction function of the SR

18
Q

How to test the Inferior Rectus

A

look lateral, then down

lateral opposes the adduction function of the IR

19
Q

How to test the Inferior Oblique

A

look medial, then up

medial opposes the abduction function of the IO

20
Q

How to test the Superior Oblique

A

look medial, then down

medial opposes the abduction function of the SO

21
Q

By having patient follow your finger as you trace an “H” in front of each eye…

A

you can test the 3 cranial nerves involved in extraocular movement (III, IV, and VI)

22
Q

Problems with Oculomotor nerve (III) cause

A

affected eye to drift down and out

23
Q

Loss of oculomotor nerve cause muscles supplied by trochlear and abducens to take over…

A

•trochlear (SO) - depress and abducts eye
•abducens (LR) - abducts eye
*Patient will also have ptosis and mydriasis

24
Q

ptosis is

A

drooping of eyelid

25
mydriasis is
pupil dilation
26
Problems with Trochlear nerve (IV) cause
affected eye to drift upward
27
Loss of trochlear nerve cause muscles supplied by oculomotor and abducens to take over...
* oculomotor * abducens (LR) - abducts eye * some loss of depression will occur, ab- and adduction will be normal
28
Problems with Abducens nerve (VI) cause
affected eye to drift medially
29
Loss of abducens nerve cause muscles supplied by oculomotor and trochlear to take over...
the strong adductor of the eye will take over (MR)