Extrinsic Eye Muscles

Question 1

Levator Palpebrae Superioris

Answer 1

origin: lesser wing of sphenoid.
insertion: superior tarsal plate, skin of eyelid.
innervation: CN III, upper division
action: elevate upper eye lid

Question 2

Superior Rectus

Answer 2

origin: common tendinous ring.
insertion: anterior hemisphere of eye ball: superiorly
innervation: CN III, upper division
action: elevation, adduction, intorsion of eyeball

Question 3

Inferior Rectus

Answer 3

origin: common tendinous ring
insertion: anterior hemisphere of eyeball: inferiorly
innervation: CN, III lower division
action: depression, adduction, extorsion of the eyeball

Question 4

Medial Rectus

Answer 4

origin: common tendinous ring
insertion: anterior hemisphere of eyeball: medially
innervation: CN III, lower division
action: adduction of the eyeball

Question 5

Lateral Rectus

Answer 5

origin: common tendinous ring
insertion: anterior hemisphere of eyeball: laterally
innervation: CN VI
action: abduction of the eyeball

Question 6

Superior Oblique

Answer 6

origin: body of sphenoid
insertion: lateral posterior quadrant of eyeball
innervation: CN IV
action: depression, abduction, intorsion of eyebally

Question 7

Inferior Oblique

Answer 7

origin: medial floor of orbit posterior to rim
insertion: laterl posterior quadrant of eyeball
innervation: CN III, lower division
action: elevation, abduction, extorsion of the eyeball