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Ocular Block 5 > EOMs > Flashcards

EOMs Flashcards

(68 cards)

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1
Q

What is the embryonic derivative of the EOMs?

A

Mesodermal origin

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2
Q

When do the EOMs begin developing

A

Week 3 of gestation

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3
Q

When are the EOMs fully formed

A

6 months, but continue to enlarge during remaining part of gestation

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4
Q

Microaantomy of EMOs

A

Striated muscles with actin and myosin

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5
Q

Eye movements are _______ and more __________ due to unique combination of white (fast) and red (slow) muscle fibers

A

Faster

Fatigue resistant

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6
Q

What are the two layers of the EOMS

A
  • orbital (superficially)

- globular (deeper)

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7
Q

What are the 4 rectus muscles

A

Inferior
Superior
Medial
Lateral

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8
Q

What are the two oblique muscles

A

Superior and inferior

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9
Q

What two muscles only have 1 action?

A

Medial and lateral rectus

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10
Q

Primary action of medial rectus

A

Auction

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11
Q

Primary action of lateral rectus

A

Abduction

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12
Q

Primary, secondary, and tertiary action of superior rectus

A

Elevation
Intorsion
Adduction

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13
Q

Primary, secondary, an tertiary actions of the inferior rectus

A

Depression
Extortion
Adduction

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14
Q

Primary, secondary, and tertiary actions of superior oblique

A

Intorsion
Depression
Abduction

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15
Q

Primary, secondary, and tertiary actions of inferior oblique

A

Extortion
Elevation
Abduction

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16
Q

What is the primary action for the obliques?

A

Torsions

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17
Q

Where do all 4 of the recti muscles originate?

A

Annulus of zinn or common tendinous ring

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18
Q

What structure is the annulus of zinn in?

A

Oculomotor foramen

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19
Q

What passes through the oculomotor foramen?

A
  • oculomotor nerve
  • optic nerve
  • ophthalmic artery
  • abducens nerve
  • nasociliary nerve
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20
Q

What EOM inserts closest to the limbus?

A

Medial rectus

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21
Q

What is the spiral of tillaux

A

The insertions of the EOMs relative to the limbus become further and further from the limbus going clockwise(OD)

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22
Q

Order of spiral of tillaux

A

Medial rectus
Lateral rectus
Superior rectus
Inferior rectus

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23
Q

Origin of levator palpebrae superioris

A

Lesser wing of sphenoid bone

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24
Q

Action of levator palpebrae superioris

A

Elevation of upper lid

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25
Innervation of levator palpebrae superioris
CNIII
26
How does the superior rectus run?
Passes beneath levator, above superior oblique on globe
27
Primary action of the superior rectus
Elevation
28
Origin of superior rectus
Annulus of zinn
29
Innervation of superior rectus
Superior division of CNIII
30
Blood supply to the superior rectus
Superior lateral muscular branch of ophthalmic artery
31
What is the largest EOM?
Medial rectus
32
Primary action of medial rectus
Adducts
33
Origin of medial rectus
Annulus of zinn
34
Blood supply of medial rectus
Inferior medial muscular branch of ophthalmic artery
35
Primary action of inferior rectus
Depresses
36
Innervation of inferior rectus
Inferior division of the CNIII
37
Primary action of lateral rectus
Abducts
38
Origin of lateral rectus
Superior and inferior annulus of zinn, and greater wing of sphenoid bone
39
Innervation of lateral rectus
CN VI abducens
40
Longest and thinnest EOM
Superior oblique
41
Innervation of superior oblique
Trochlear
42
Shortest EOM
Inferior oblique
43
Origin of inferior oblique
Maxillary bone (only EOM to have its anatomical origin in the anterior orbit)
44
What is the only EOM to have its anatomic origin in the anterior orbit
Inferior oblique
45
What are check ligaments
Provide stop to excessive movement
46
Eyes aligned around sagittal and horizontal plane, head erect, focus infinity
Primary gaze
47
Rotation around a single Fick axis (levoversion; left gaze)
Secondary gaze
48
Rotation around both horizontal and vertical axis (levodepression; or down or left)
Tertiary gaze
49
X axis
Elevation/depression
50
Y axis
Torsional movements
51
Z axis
Abduction/abduction
52
The plane passing through the center of roatation of the eye and contains the X and Z axes
Listings plane
53
Movement involving one eye
Ductions
54
Ductions movements
Abduction Abduction Supraduction Infraduction
55
Tested by occluding one eye and asking the patient to follow target in each direction of gaze
Ductions
56
Conjugate movement of both eyes in the same direction
Versions
57
Eight positions of gaze with version movements
- infraversions (downward gaze) - supraversion (upward gaze) - dextroversion (right gaze) - levoversion (left gaze) - infralevoversion (downward left gaze) - infradextroversion (downward right gaze) - supralevoversion (upward left gaze) - supradextroversion (upward right gaze)
58
Tested with both eyes open and asking the patient to follow a target in each direction of gaze
Versions
59
Disjunctive movement of both eyes
Vergence
60
Both eyes looking inward
Convergence
61
Booth eyes looking outward
Divergence
62
What EOMs are innervated by the superior division of CN III
Superior rectus
63
What EOMs are innervated by the inferior division of CN III
- medial rectus - inferior rectus - inferior oblique
64
EOMs ar predominantly supplied by
Two muscular branches from the ophthalmic artery
65
Largest vein in the orbit
Superior ophthalmic vein
66
What is responsible for majority of venous drainage of the eye
Superior ophthalmic vein
67
Receives blood from the muscular veins draining the SR and MR
Superior ophthalmic vein
68
Receives blood from the muscular veins draining the MR, IR, IO, and IR
Inferior ophthalmic vein

Ocular Block 5 (8 decks)

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