Muscles of the eye

Question 1

Intrinsic muscles of the eye

Answer 1

• Ciliaris muscle
• Constrictor pupillae
• Dilator pupillae

Question 2

Ciliaris muscle

Answer 2

Inside the ciliary body
Parasympathetic innervation via the oculomotor nerve
Responsible for accommodation of the eye

Question 3

Constrictor pupillae

Answer 3

Found at border of the iris
Constricts pupil
Innervated via parasympathetic system of oculomotor

Question 4

Dilator pupillae

Answer 4

Radially running roundiris
Dilates pupil
Has sympathetic innervation

Question 5

Extrinsic muscles of the eye

Answer 5

4 rectus muscles

Superior and inferior oblique muscles

Question 6

Function of the extrinsic muscles

Answer 6

Elevation 
Depression 
Abduction 
Adduction 
intorsion 
extorsion

Question 7

Superior rectus function

Answer 7

Elevation
Abduction
Intorsion

Question 8

Inferior rectus function

Answer 8

Depression
Adduction
Extorsion

Question 9

Superior oblique muscle course

Answer 9

Starts at apex of orbit 
Runs medially 
Attaches to orbit via trochlea
Changes direction 
Attaches to the sclera at the back

Question 10

Inferior oblique muscle course

Answer 10

Only muscle to start at the front of the orbit, slings under eyelid, to the sclera at the back

Question 11

Function of superior oblique muscle

Answer 11

Depression
Abduction
Extorsion

Question 12

Function of inferior oblique

Answer 12

elevation
Adduction
Intorsion

Question 13

Function of lateral rectus

Answer 13

Abducts the eye

Question 14

Function of medial rectus

Answer 14

adducts the eye

Question 15

what is the name of the ligaments which prevent over-adduction of the eye?

Answer 15

medial and lateral check ligaments

Question 16

Innervation of the muscles of the eye

Answer 16

Oculomotor: innervates the majority of the muscles of the eye
Trochlear nerve: innervates the SOM
Abducens muscle: innervates the lateral rectus muscle (muscle which abducts the eye)