Muscles of the Eye Flashcards Preview

ESA 4 - Head and Neck > Muscles of the Eye > Flashcards

Flashcards in Muscles of the Eye Deck (36):
1

How many muscles control the movements of the eyeball? 

6

2

What are the categories of muscle controlling the eye? 

  • Recti (4)
  • Oblique (2)

3

What do all the recti muscles of the eye arise from? 

Common tendinous ring

4

What is the common tendinous ring? 

A fibrous cuff that surrounds the optic canal

5

Draw a diagram illustrating the action of muscles on the eyeball

6

What is the origin of the superior rectus? 

Superior part of the common tendionous ring

7

What is the insertion of the superior rectus? 

Superior and anterior aspect of sclera

8

What is the innervation of the superior rectus? 

Oculomotor nerve

9

What is the action of the superior rectus? 

  • Elevation
  • Contributes to adduction and medial rotation

 

10

What is the origin of the inferior rectus?

Inferior part of common tendinous ring

11

What is the insertion of the inferior rectus? 

Inferior and anterior aspect of the sclera

12

What is the innervation of the inferior rectus?

Oculomotor nerve

13

What is the action of the inferior rectus? 

  • Depression
  • Contributes to the adduction and lateral rotation of the eyeball

 

14

What is the origin of the medial rectus?

Medial part of common tendinous ring

15

What is the insertion of the medial rectus?

Antero-medial aspect of sclera

16

What is the innervation of the medial rectus? 

Oculomotor nerve

17

What is the action of the medial rectus?

Adducts

18

What is the origin of the lateral rectus?

Lateral part of the common tendinous ring

19

What is the insertion of the lateral rectus? 

Antero-lateral aspect of sclera

20

What is the innervation of the lateral rectus? 

Abducens nerve

21

What is the action of the lateral rectus? 

Abducts

22

What is the origin of the superior oblique?

Body of sphenoid bone

23

What is the insertion of the superior oblique? 

Sclera of eye, posterior to superior rectus

24

What is the innervation of the superior oblique? 

Trochlear nerve

25

What is the action of the superior oblique? 

Depresses, abducts, and medially rotates

26

What is the origin of the inferior oblique? 

Anterior aspect of the orbital floor

27

What is the insertion of the inferior oblique? 

Sclera of eye, posterior to lateral rectus

28

What is the innervation of the inferior oblique? 

Oculomotor nerve

29

What is the action of the inferior oblique? 

Elevates, abducts, and laterally rotates the eyeball

30

What does movement of the eyelids occur via the action of? 

  • Orbicularis oculi muscle
  • Levator palpebrae superioris muscle

 

31

What does the orbicularis oculi muscle do? 

Closes the eyelid

32

What is the orbicularis oculi muscle innervated by?

The facial nerve

33

What does the levator palpebrae superioris muscle do?

Opens the eyelid

34

What is the leavtor palpebrae superioris muscle innervated by?

The oculomotor nerve

35

What is complete ptosis caused by?

A CN III lesion

36

What is partial ptosis caused by?

A sympathetic lesion