External Cranium Face - Orbital Muscles Flashcards

1
Q

Levator Palpebrae Superiors Origin

A

Lesser wing of sphenoid bone, superior and anterior to optic canal

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2
Q

Levator Palpebrae Superiors Insertion

A

Superior tarsus and skin of superior eyelid

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3
Q

Levator Palpebrae Superiors Innervation

A

Oculomotor nerve (CN III); deep layer (superior tarsal muscle) is supplied by sympathetic fibers

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4
Q

Levator Palpebrae Superiors Action

A

Elevates superior eyelid

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5
Q

Superior Rectus (SR) Origin

A

Common tendinous ring

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6
Q

Superior Rectus (SR) Insertion

A

Sclera just posterior to corneoscleral junction

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7
Q

Superior Rectus (SR) Innervation

A

Oculomotor nerve (CN III)

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8
Q

Superior Rectus (SR) Action

A

Elevates, adducts and rotates eyeball medially

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9
Q

Medial Rectus (MR) Origin

A

Common tendinous ring

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10
Q

Medial Rectus (MR) Insertion

A

Sclera just posterior to corneoscleral junction

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11
Q

Medial Rectus (MR) Innervation

A

Oculomotor nerve (CN III)

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12
Q

Medial Rectus (MR) Action

A

Adducts eyeball

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13
Q

Lateral Rectus (LR) Origin

A

Common tendinous ring

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14
Q

Lateral Rectus (LR) Insertion

A

Sclera just posterior to corneoscleral junction

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15
Q

Lateral Rectus (LR) Innervation

A

Abducent nerve (CN VI)

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16
Q

Lateral Rectus (LR) Action

A

Abducts eyeball

17
Q

Inferior Rectus (IR) Origin

A

Common tendinous ring

18
Q

Inferior Rectus (IR) Insertion

A

Sclera just posterior to corneoscleral junction

19
Q

Inferior Rectus (IR) Innervation

A

Oculomotor nerve (CN III)

20
Q

Inferior Rectus (IR) Action

A

Depresses, adducts, and rotates eyeball laterally

21
Q

Superior Oblique (SO) Origin

A

Body of sphenoid bone

22
Q

Superior Oblique (SO) Insertion

A

Its tendon passes through a fibrous ring or trochlea, changes its direction, and inserts into sclera deep to superior rectus muscle

23
Q

Superior Oblique (SO) Innervation

A

Trochlear nerve (CN IV)

24
Q

Superior Oblique (SO) Action

A

Abducts, depresses, and medially rotates eyeball

25
Inferior Oblique (IO) Origin
Anterior part of floor of orbit
26
Inferior Oblique (IO) Insertion
Sclera deep to lateral rectus muscle
27
Inferior Oblique (IO) Innervation
Oculomotor nerve (CN III)
28
Inferior Oblique (IO) Action
Abducts, elevates, and laterally rotates eyeball