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Ophthalmology SOH > Extraocular muscles > Flashcards

Extraocular muscles Flashcards

1
Q

Name the 7 extra ocular muscles

A 
Medial rectus (MR)
Lateral rectus (LR) 
Superior rectus (SR)
Inferior rectus (IR)
Superior oblique (SO)
Inferior oblique (IO) 
Levator palpebrae superioris (LPS)
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2
Q

Rectus muscles - origination and attachment

A

Originate - common tendinous ring

Attach - sclera

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3
Q

What is the name of the tendon of SO ?

A

Trochlea

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4
Q

What is the function of LPS?

A

Elevates the upper eyelid

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5
Q

Which CN innervates the LR?

A

CN VI (abducent)

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6
Q

Which CN innervates the SO?

A 
CN IV (trochlear) 
- think sulphate (SO4)
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7
Q

Which muscles does CN III innervate?

A

MR, IO, SR, IR, LPS

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8
Q

When clinically testing the eye, movements occur from the ‘primary position’. Describe this

A

Gaze directed forward
face forward
eyes forward
looking straight ahead

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9
Q

How do you test individual muscles?

A

Make sure that the plane of the muscle is matched up with the gaze of the eyeball

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10
Q

Which 2 muscles are involved in elevation of the eyeball?

A

Superior rectus

Inferior oblique

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11
Q

Which 2 muscles are involved in depression of the eyeball

A

Inferior rectus

Superior oblique

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12
Q

What is the function of LR?

A

Abducts the eyeball

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13
Q

What is the function of MR?

A

Adducts the eyeball

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14
Q

How do you test SR muscle?

A

Must first abduct the eye (LR)

  • LR brings the eyeball gaze into the same plane as SR and IR
  • get patient to look up
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15
Q

SR eye movement

A

Patient looks out and up

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16
Q

how do you test IR muscle?

A

Must first abduct the eye (LR)

  • LR brings the eyeball gaze into the same plane as SR and IR
  • get patient to look down
17
Q

IR eye movement

A

Patient looks out and down

18
Q

How do you test SO?

A

Must first adduct the eye (MR)

  • MR brings the eyeball gaze into the same plane as SO and IO
  • get patient to look down
19
Q

SO eye movement

A

Patient looks in and down

20
Q

How do you test IO?

A

Must first adduct the eye (MR)

  • MR brings the eyeball gaze into the same plane as SO and IO
  • get patient to look up
21
Q

IO eye movements

A

Patient looks in and up

Ophthalmology SOH (12 decks)

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