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Clinical Morphology > Week 8: Extraocular Movements > Flashcards

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
Q

mydriasis is

A

pupil dilation

26
Q

Problems with Trochlear nerve (IV) cause

A

affected eye to drift upward

27
Q

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

A
  • oculomotor
  • abducens (LR) - abducts eye
  • some loss of depression will occur, ab- and adduction will be normal
28
Q

Problems with Abducens nerve (VI) cause

A

affected eye to drift medially

29
Q

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

A

the strong adductor of the eye will take over (MR)

Clinical Morphology (25 decks)

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