Session 8: Extra-Ocular Eye Muscles And Their Actions Flashcards

1
Q

What cranial nerves supply muscles that move the eyeball?

A

CN III, CN IV and CN VI

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2
Q

Which division of the nervous system are the intrinsic muscles of the eye innervated by?

A

Autonomic

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3
Q

What type of nerves supply the extra-ocular muscles?

A

Somatic motor nerves

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4
Q

Where on the eye do the extra ocular muscles attach?

A

The sclera

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5
Q

Which two extra-ocular muscles are not innervated by CN III?

A

Lateral rectus and superior oblique

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6
Q

What muscles move the eyes directly upwards?

A

Superior rectus and inferior oblique

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7
Q

What muscles move the eyes directly downwards?

A

Superior oblique and inferior rectus

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8
Q

What is the action of the superior oblique muscle?

A

Moves the eyeball down and out and intorts the eyeball

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9
Q

What is the action of the inferior oblique muscle?

A

Rolls the eye up and out and extorts the eyeball

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10
Q

What is the action of the superior rectus muscle?

A

Rolls the eye up and in

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11
Q

What is the action of the inferior rectus muscle?

A

Rolls the eye down and in

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12
Q

How do you examine the eye movements of lateral and medial rectus?

A

Test abduction and adduction of the eye

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13
Q

How do you test the action of the superior oblique?

A

Move the eye to the medial position then ask the patient to move the eye down

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14
Q

How do you test the action of inferior rectus?

A

Move the eye laterally and then move the eyeball down

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15
Q

How do you test the action of the inferior oblique muscle?

A

Move the eye into the medial position them move the eyeball upwards

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16
Q

How do you test the action of the superior rectus muscle?

A

Move the eye laterally then move the eyeball up

17
Q

How will a patient present with Palsy of CN IV?

A

Extorted eyeball held upwards and inwards

Head held slightly tilted