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pt gross > External Cranium Face - Orbital Muscles > Flashcards

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
Q

Inferior Oblique (IO) Origin

A

Anterior part of floor of orbit

26
Q

Inferior Oblique (IO) Insertion

A

Sclera deep to lateral rectus muscle

27
Q

Inferior Oblique (IO) Innervation

A

Oculomotor nerve (CN III)

28
Q

Inferior Oblique (IO) Action

A

Abducts, elevates, and laterally rotates eyeball

pt gross (17 decks)

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