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4: Y4 - Ophthalmology [14] > [16] Muscles of the Eye > Flashcards

[16] Muscles of the Eye Flashcards

1
Q

How many muscles control the movements of the eyeball?

A

6

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2
Q

What are the categories of muscle controlling the eye?

A
  • Recti (4)
  • Oblique (2)
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3
Q

What do all the recti muscles of the eye arise from?

A

Common tendinous ring

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4
Q

What is the common tendinous ring?

A

A fibrous cuff that surrounds the optic canal

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5
Q

Draw a diagram illustrating the action of muscles on the eyeball

A
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6
Q

What is the origin of the superior rectus?

A

Superior part of the common tendionous ring

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7
Q

What is the insertion of the superior rectus?

A

Superior and anterior aspect of sclera

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8
Q

What is the innervation of the superior rectus?

A

Oculomotor nerve

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9
Q

What is the action of the superior rectus?

A
  • Elevation
  • Contributes to adduction and medial rotation
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10
Q

What is the origin of the inferior rectus?

A

Inferior part of common tendinous ring

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11
Q

What is the insertion of the inferior rectus?

A

Inferior and anterior aspect of the sclera

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12
Q

What is the innervation of the inferior rectus?

A

Oculomotor nerve

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13
Q

What is the action of the inferior rectus?

A
  • Depression
  • Contributes to the adduction and lateral rotation of the eyeball
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14
Q

What is the origin of the medial rectus?

A

Medial part of common tendinous ring

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15
Q

What is the insertion of the medial rectus?

A

Antero-medial aspect of sclera

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16
Q

What is the innervation of the medial rectus?

A

Oculomotor nerve

17
Q

What is the action of the medial rectus?

A

Adducts

18
Q

What is the origin of the lateral rectus?

A

Lateral part of the common tendinous ring

19
Q

What is the insertion of the lateral rectus?

A

Antero-lateral aspect of sclera

20
Q

What is the innervation of the lateral rectus?

A

Abducens nerve

21
Q

What is the action of the lateral rectus?

A

Abducts

22
Q

What is the origin of the superior oblique?

A

Body of sphenoid bone

23
Q

What is the insertion of the superior oblique?

A

Sclera of eye, posterior to superior rectus

24
Q

What is the innervation of the superior oblique?

A

Trochlear nerve

25
Q

What is the action of the superior oblique?

A

Depresses, abducts, and medially rotates

26
Q

What is the origin of the inferior oblique?

A

Anterior aspect of the orbital floor

27
Q

What is the insertion of the inferior oblique?

A

Sclera of eye, posterior to lateral rectus

28
Q

What is the innervation of the inferior oblique?

A

Oculomotor nerve

29
Q

What is the action of the inferior oblique?

A

Elevates, abducts, and laterally rotates the eyeball

30
Q

What does movement of the eyelids occur via the action of?

A
  • Orbicularis oculi muscle
  • Levator palpebrae superioris muscle
31
Q

What does the orbicularis oculi muscle do?

A

Closes the eyelid

32
Q

What is the orbicularis oculi muscle innervated by?

A

The facial nerve

33
Q

What does the levator palpebrae superioris muscle do?

A

Opens the eyelid

34
Q

What is the leavtor palpebrae superioris muscle innervated by?

A

The oculomotor nerve

35
Q

What is complete ptosis caused by?

A

A CN III lesion

36
Q

What is partial ptosis caused by?

A

A sympathetic lesion

4: Y4 - Ophthalmology [14] (16 decks)

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