The Extraocular Muscles

Question 1

What is Diplopia

Answer 1

Double vision

Question 2

What is the vestibular apparatus important for

Answer 2

Balance and detecting movement of the head

Question 3

How many muscles control the movement of the eyes

Answer 3

7 muscles

Question 4

What are conjugated movements of the eye

Answer 4

Coordinated movements of both eyes allowing us to form 1 image

Question 5

What muscle lifts the upper eyelid

Answer 5

Levator palpabrae superioris

Question 6

What 6 muscles work to move the eye

Answer 6

Medial rectus
Lateral rectus
Superior rectus
Inferior rectus
Superior oblique
Inferior oblique

Question 7

What 3 cranial nerves are involved with the movement of the eye

Answer 7

Oculomotor
Trochlear
Abducens

Question 8

What nerve innervates the superior oblique

Answer 8

The trochlear

Question 9

What nerve innervates the lateral rectus

Answer 9

The Abducens

Question 10

What does the oculomotor nerve innervate

Answer 10

Levator palpabrae superioris
Medial rectus
Superior rectus
Inferior rectus
Inferior oblique

Question 11

Where do the muscles that move the eyeball originate

Answer 11

All muscles that move the eyeball originate from the orbital bones around the eye

Question 12

Where do the muscles that move the eyeball insert

Answer 12

They all insert into the sclera

Question 13

Where does the levator palpebrae superioris insert

Answer 13

Into the upper lid

Question 14

What is the role of the levator palpebrae superioris

Answer 14

Elevates the upper eye lid

Question 15

What is ptosis

Answer 15

Drooping of the eye lid

Question 16

What cranial nerve is the oculomotor nerve

Answer 16

The 3rd cranial nerve

Question 17

What is the role of the medial rectus

Answer 17

Moves the eye medially (adducts the eye)

Question 18

What is the role of the lateral rectus

Answer 18

Moves the eye laterally (abducts the eye)

Question 19

What cranial nerve is the abducens

Answer 19

6th cranial nerve

Question 20

What is the role of the superior rectus

Answer 20

Primary- elevates the eye
Secondary- adducts and medially rotates

Question 21

What is the role of the inferior rectus

Answer 21

Primary- depresses the eye
Secondary- adducts and laterally rotates

Question 22

What is the role of the superior oblique

Answer 22

Primary- medially rotates the eye
Secondary- depresses and abducts

Question 23

What cranial nerve is the trochlear nerve

Answer 23

The 4th cranial nerve

Question 24

What is the role of the inferior oblique

Answer 24

Primary- laterally rotates the eye
Secondary- elevates and abducts

Question 25

What does the inner ear contain

Answer 25

Cochlear
Vestibular apparatus

Question 26

What is the cochlear important for

Answer 26

Sound

Question 27

What is the vestibular apparatus important for

Answer 27

Balance

Question 28

What are the structures involved in the vestibular apparatus

Answer 28

Utricle
Saccule
3 semicircular ducts

Question 29

What do the semicircular ducts contain

Answer 29

They contain sense organs for balance

Question 30

What is endolymph

Answer 30

The fluid found in the semicircular ducts in the inner ear

Question 31

Where do the semicircular ducts empty into

Answer 31

The utricle

Question 32

What is the role of the semicircular ducts

Answer 32

They detect movements of the head

Question 33

Where are vestibular nuclei located

Answer 33

In the brainstem

Question 34

Signals received to the vestibular nuclei control what

Answer 34

Posture
Balance
Conscious awareness of position

Question 35

What cranial nerves are connects to the vestibular nuclei

Answer 35

Cranial nerve 3
Cranial nerve 4
Cranial nerve 6

Question 36

What is the oculocephalic reflex

Answer 36

This is maintaining a fixed gaze when the head is moving