Anatomy: Extraocular Muscles

Question 1

Extraocular muscles

Answer 1

Located within the orbit.

Act to control the movement of the eyeball and superior eyelid.

Question 2

Extraocular muscles responsible for eye movement (6)

Answer 2

Superior rectus 
inferior rectus 
medial rectus 
lateral rectus 
inferior oblique 
superior oblique

Question 3

Responsible for superior eyelid movement (1)

Answer 3

levator palpebrae superioris

Question 4

levator palpebrae superioris

Answer 4

Only muscle involves in raising superior eyelid.

Question 5

LPS Attachments

Answer 5

Originates from lesser wing of sphenoid bone, immediately above the optic foramen
Attaches to superior tarsal plate of upper eyelid

Question 6

LPS Actions

Answer 6

Elevates upper eyelid

Question 7

LPS innervation

Answer 7

Oculomotor nerve (CN III)

Question 8

Superior tarsal muscle

Answer 8

Collection of smooth muscle fibres within levator palpebrae superiors

Question 9

Superior tarsal muscle innervation

Answer 9

sympathetic nervous system

Question 10

Recti muscles origin

Answer 10

characteristically originate from common tendinous ring.

From origin, muscles pass anteriorly to attach to sclerotic of the eyeball

Question 11

Common tendinous ring

Answer 11

ring of fibrous tissue, which surrounds the optic canal at the back of the orbit

Question 12

Superior rectus attachments

Answer 12

Origin: superior part of common tendinous ring

Attaches to superior and anterior aspect of sclera

Question 13

Superior rectus actions

Answer 13

Elevation

Also contributes to adduction and medial rotation of the eyeball

Question 14

Superior rectus innervation

Answer 14

Oculomotor (CN III)

Question 15

Inferior rectus attachments

Answer 15

origin: inferior part of common tendinous ring

Attaches to inferior and anterior aspect of the slur

Question 16

Inferior rectus actions

Answer 16

depression

also contributes to adduction and lateral rotation of the eyeball

Question 17

inferior rectus innervation

Answer 17

Oculomotor nerve (CN III)

Question 18

Medial rectus attachments

Answer 18

Origin: medial part of common tendinous ring

Attaches to anteromedial aspect of sclera

Question 19

medial rectus actions

Answer 19

Adducts the eyeball

Question 20

Medial rectus innervation

Answer 20

Oculomotor nerve (CN III)

Question 21

Lateral rectus attachments

Answer 21

originates from lateral part of common tendinous ring

Attaches to anterolateral aspect of sclera

Question 22

Lateral rectus actions

Answer 22

abducts the eyeball

Question 23

Lateral rectus innervation

Answer 23

Abducens nerve (CN VI)

Question 24

Oblique muscles approach to the eyeball

Answer 24

Angular approach

Attach to posterior surface of sclera

Question 25

Superior oblique attachments

Answer 25

originates from sphenoid bone | Tendon passes through trochlea and then attaches to sclera of the eye, posterior to superior rectus

Question 26

superior oblique actions

Answer 26

depresses, abducts and medially rotates the eyeball

Question 27

Superior oblique innervation

Answer 27

Trochlear nerve (CN IV)

Question 28

Inferior oblique attachments

Answer 28

Originates from anterior aspect of orbital floor Attaches to the sclera of the eye, posterior to lateral rectus

Question 29

Inferior oblique actions

Answer 29

Elevates, abducts and laterally rotates eyeball

Question 30

Inferior oblique innervation

Answer 30

Oculomotor nerve (CN III)