External Cranium Face - Orbital Muscles Flashcards Preview

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Flashcards in External Cranium Face - Orbital Muscles Deck (28)
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1

Levator Palpebrae Superiors Origin

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

2

Levator Palpebrae Superiors Insertion

Superior tarsus and skin of superior eyelid

3

Levator Palpebrae Superiors Innervation

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

4

Levator Palpebrae Superiors Action

Elevates superior eyelid

5

Superior Rectus (SR) Origin

Common tendinous ring

6

Superior Rectus (SR) Insertion

Sclera just posterior to corneoscleral junction

7

Superior Rectus (SR) Innervation

Oculomotor nerve (CN III)

8

Superior Rectus (SR) Action

Elevates, adducts and rotates eyeball medially

9

Medial Rectus (MR) Origin

Common tendinous ring

10

Medial Rectus (MR) Insertion

Sclera just posterior to corneoscleral junction

11

Medial Rectus (MR) Innervation

Oculomotor nerve (CN III)

12

Medial Rectus (MR) Action

Adducts eyeball

13

Lateral Rectus (LR) Origin

Common tendinous ring

14

Lateral Rectus (LR) Insertion

Sclera just posterior to corneoscleral junction

15

Lateral Rectus (LR) Innervation

Abducent nerve (CN VI)

16

Lateral Rectus (LR) Action

Abducts eyeball

17

Inferior Rectus (IR) Origin

Common tendinous ring

18

Inferior Rectus (IR) Insertion

Sclera just posterior to corneoscleral junction

19

Inferior Rectus (IR) Innervation

Oculomotor nerve (CN III)

20

Inferior Rectus (IR) Action

Depresses, adducts, and rotates eyeball laterally

21

Superior Oblique (SO) Origin

Body of sphenoid bone

22

Superior Oblique (SO) Insertion

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

23

Superior Oblique (SO) Innervation

Trochlear nerve (CN IV)

24

Superior Oblique (SO) Action

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