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Med School Yr 2 > Extraocular Muscles > Flashcards

Extraocular Muscles Flashcards

1
Q

what is the role of the extraocular muscles?

A

control the movements of the eyeball and the superior eyelid

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2
Q

how many extraocular muscles are there?

A

7

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3
Q

list the extraocular muscles

A
  • levator palpebrae superioris
  • superior rectus
  • inferior rectus
  • medial rectus
  • lateral rectus
  • inferior oblique
  • superior obliue
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4
Q

what extraocular muscles are responsible for eye movement?

A

recti and oblique muscles

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5
Q

what extraocular muscles are responsible for superior eyelid movement?

A

levator palpebrae superioris

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6
Q

levator palpebrae superioris
* origin?
* insertion?

A
  • lesser wing of sphenoid, above optic foramen
  • superior tarsal plate of upper eyelid
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7
Q

a portion of the LPS contains a collection of smooth muscle fibres - what are these?

A

superior tarsal muscles

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8
Q

what is the innervation of the LPS?

A

oculomotor nerve (CNIII)

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9
Q

what is the superior tarsal muscle innervated by?

A

sympathetic nevous system

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10
Q

what is the action of the LPS?

A

elevates upper eyelid

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11
Q

what is the annulus of zinn?

A

tendinous ring of fibrous tissue that surrounds the optic canal at the back of the orbit

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12
Q

superior rectus
* origin?
* insertion?

A
  • origin - annulus of zinn
  • insertion - superior anterior sclera
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13
Q

what is the action of the superior rectus?

A
  • elevation
  • adduction and intorsion
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14
Q

what is the innervation of the superior rectus?

A

oculomotor nerve (CN III)

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15
Q

inferior rectus
* origin?
* insertion?

A
  • origin - annulus of zinn
  • insertion - inferior anterior sclera
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16
Q

what is the action of the inferior rectus muscle?

A
  • depression
  • adduction and extorsion
17
Q

what innervates the inferior rectus muscle?

A

oculomotor nerve (CN III)

18
Q

medial rectus
* origin?
* insertion?

A
  • origin - annulus of zinn
  • insertion - medial anterior sclera
19
Q

what is the action of the medial rectus?

A

adducts the eyeball

20
Q

what is the innervation of the medial rectus?

A

oculomotor nerve (CN III)

21
Q

lateral rectus
* origin?
* insertion?

A
  • origin - annulus of zinn
  • insertion - lateral anterior sclera
22
Q

what is the action of the lateral rectus?

A

abducts the eye

23
Q

what is the innervation of the lateral rectus?

A

abducens nerve (CN VI)

24
Q

superior oblique
* origin?
* insertion?

A
  • origin - body of sphenoid
  • insertion - superior posterolateral sclera
25
Q

what is the action of the superior oblique?

A
  • intorsion
  • depression + abduction
26
Q

what is the innervation of the superior oblique?

A

trochlear nerve (CNIV)

27
Q

inferior oblique
* origin?
* insertion?

A
  • origin - anterior orbital floor
  • insertion - inferior posterolateral sclera
28
Q

what is the action of the inferior oblique muscle?

A
  • extorsion
  • abduction, elevation
29
Q

what is the innervation of the inferior oblique muscle?

A

oculomotor nerve (CN III)

30
Q

yawing

A

adduction and abduction

31
Q

pitching

A

elevation and depression

32
Q

cranial nerve palsy - damage to oculomotor nerve?

A
  • eye displaced laterally by lateral rectus
  • displaced inferiorly by superior oblique

“down and out”

33
Q

cranial nerve palsy - damage to trochlear nerve?

A
  • superior oblique muscle paralysed
  • no obvious effect to resting orientation
  • complaints of diplopia and may develop head tilt away from site
34
Q

cranial nerve palsy - damage to abducens nerve?

A
  • paralyse lateral rectus muscle
  • affected eye adducts by resting tone of medial rectus
35
Q

Label the extraocular muscles

A
36
Q

Label the muscles of the upper eye

A
37
Q

Label the eye movements

A

Med School Yr 2 (96 decks)

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