Extrinsic Eye Muscles

Question 1

True or false: the extrinsic eye eye muscles are some of the slowest and least coordinated muscles in the body

Answer 1

false: the extrinsic eye muscles are some of the fastest and most precisely controlled muscles in the body

Question 2

Typically where do they extrinsic eye muscles originate and insert?

Answer 2

originate in orbit and insert of the white of the eyeball

Question 3

Which extrinsic eye muscles DOES NOT insert in the eyeball?

Answer 3

levator palpebrae superioris

Question 4

How many extrinsic eye muscles are there?

Answer 4

7

Question 5

How many recti extrinsic eye muscles are there? Name them

Answer 5

4: superior rectus
inferior rectus
lateral rectus
medial rectus

Question 6

How many oblique extrinsic eye muscles are there? Name them

Answer 6

2: superior oblique

inferior oblique

Question 7

Where is the common tendinous ring? Why is it important?

Answer 7

in the back of the orbit, most extrinsic eye muscles originate from one

Question 8

What extrinsic eye muscles do not originate in a common tendinous ring?

Answer 8

LPS

inferior oblique

Question 9

What direction do recti muscles move the eyeball

Answer 9

superiorly, inferiorly, laterally and medially

Question 10

What direction do the oblique muscles move the eyeball?

Answer 10

inferiorly and laterally
OR
superior and laterally

Question 11

What is the origin of the superior rectus

Answer 11

common tendinous ring

Question 12

What is the insertion of the superior rectus

Answer 12

superior and central part of eyeballs

Question 13

What are the actions of the superior rectus

Answer 13

moves eyeballs superiorly, medially, and rotates medially

Question 14

What is the origin of the inferior rectus

Answer 14

common tendinous ring

Question 15

What is the insertion of the inferior rectus

Answer 15

inferior and central part of eyeballs

Question 16

What are the actions of the inferior rectus?

Answer 16

moves eyeballs inferiorly and medially

rotates laterally

Question 17

What is the origin of the lateral rectus

Answer 17

common tendinous ring

Question 18

What is the insertion of the lateral rectus

Answer 18

lateral side of eyeballs

Question 19

What are the actions of the lateral rectus

Answer 19

moves eyeballs laterally

Question 20

What is the origin of the medial rectus

Answer 20

common tendinous ring

Question 21

What is the insertion of the medial rectus

Answer 21

medial side of eyeballs

Question 22

What are the actions of the medial rectus

Answer 22

moves eyeballs medially

Question 23

What is the origin of the superior oblique

Answer 23

sphenoid bone, superior and medial to the CTR

Question 24

What is the insertion of the superior oblique

Answer 24

eyeball between sup/lat recti; superior and lateral surfaces via tendon that passes through trochlea

Question 25

What are the actions of the superior oblique

Answer 25

inferiorly and laterallly

medially rotates

Question 26

What is the origin of the inferior oblique

Answer 26

maxilla in floor of orbit

Question 27

What is the insertion of the inferior oblique

Answer 27

eyeballs between inferior and lateral recti

Question 28

What are the actions of the inferior oblique

Answer 28

superiorly and laterally

lateral rotation

Question 29

What is the origin of the levator palpebrae superiorus

Answer 29

roof of orbit

Question 30

What is the insertion levator palpebrae superiorus

Answer 30

skin and tarsal plate of upper eyelids

Question 31

What are the actions of the levator palpebrae superioris

Answer 31

elevates upper eyelid

Question 32

All extrinsic muscles of the eye (except 2) are innervated by which nerve?

Answer 32

oculomotor CNIII

Question 33

What extrinsic eye muscles are not innervated by CNIII? What are they and what nerve are the innervated by?

Answer 33

superior oblique: trochlear CNIV

lateral rectus: Abducens CNVI