Orbit II Flashcards Preview

Anatomy Final > Orbit II > Flashcards

Flashcards in Orbit II Deck (30):
1

Name the 4 rectus muscles of the eye

  • superior rectus
  • inferior rectus
  • lateral rectus
  • medial rectus 

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2

Name the 2 oblique muscles of the eye

  • Superior oblique
  • Inferior oblique 

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3

What makes up the common tendinous ring

Point of origin of 4 of the the muscles of the orbit

  • superior rectus
  • Inferior rectus
  • Lateral rectus
  • Medial rectus 

encloses optic canal and superior orbital fissure 

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4

What is the insertion and action of the levator palpebrae superioris muscle?

  • Insertion: superior tarsal plate
  • action: elevate upper eyelid 

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5

What is the innervation of the Levator Palpebrae superioris m. and Superior rectus m.

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Superior division of oculomotor (CN III)

6

What nerve innervates lateral rectus m.

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abducent (CN VI)

7

What nerve innervates inferior rectus m. and medial rectus m. 

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inferior division of oculomotor (CN III)

8

What nerve innervates the superior oblique m.

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Trochlear (CN IV) 

9

What nerve innervates the inferior oblique m.

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inferior division of oculomotor CN III 

10

What is the action of the medial rectus m.

STRONG adduction 

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11

Action of lateral rectus

STRONG ABduction 

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12

What is the action of the superior rectus m.

Strong elevation

Slight adduction

Intorsion 

  • muscle lies at a angle from the medial wall of the orbit 

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13

What is the action on inferior rectus m.

  • strong depression
  • slight adduction
  • extorsion 

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14

What is the action of the superior oblique

  • strong depression
  • slight abduction
  • intorsion 

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15

What is the action of the inferior oblique m.

  • strong elevation
  • slight abduction
  • extorsion

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16

intorsion vs extorsion

Rotation of upper cornea toward (intorsion) or away (Extorsion) from midline 

17

How can you test if a patient's superior oblique m. is not functioning?

Have him/her adduct the eye (via medial rectus) and now superior oblique is a pure depressor 

* inferior rectus cannot depress in this state; it now produces pure extorsion 

18

How can you check to see if superior rectus m. is functioning?

Have patient Abduct his/her eye (via lateral rectus); superior rectus is now a pure elevator

  • inferior oblique cannot elevate; it ow produces pure extorsion 

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19

 Name the two divisions of the oculomotor nerve (CN III).

 

  • Superior and Inferior division

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20

The superior division of oculomotor n (CN III) gives motor innervation to what 2 muscles?

  • superior rectus
  • Levator palpebrae superioris 

21

The inferior division supplies what (3 muscles) and has what type of innervation

  • medial rectus
  • inferior rectus
  • inferior oblique
  •  motor; preganglionic parasympathetics 

22

How can you distinguish the trochlear nerve after it exits the superior orbital fissure

passes along the superior surface of the superior oblique muscle 

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23

How can you distinguish the abducent nerve (CN VI) after it exits the superior orbital fissure

passes along the medial side of the lateral rectus muscle 

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24

any nerve passing through the superior orbital fissure passes through what sinus 

cavernous sinus

25

Identify purple arrow

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cavernous sinus

26

identify blue 

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oculomotor (III)

27

orange

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Trochlear n ( CN IV)

28

black

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ophthalmic n. of trigeminal (CN V1)

29

green

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maxillary nerve of trigeminal (CN V2)

30

identify

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abducent nerve