Extra Ocular Muscles

Question 1

Superior oblique

Answer 1

Origin- body of sphenoid bone

Insertion- passes through a trochlea and inserts into sclera

Innervate - trochlear nerve

Action- medically rotates , depresses, and abduct eyeball

Question 2

Superior rectus

Answer 2

Origin, common tendinous ring

Insertion, sclera just posterior to cornea

Innervate, oculomotor nerve

Action, elevates, adduct, and rotates eyeball medically

Question 3

Lateral rectus

Answer 3

Origin, common tendinous ring

Insertion, anterior sclera

Innervate, abducent nerve

Action, abduct eyeball

Question 4

Inferior rectus

Answer 4

Origin, common tendinous ring

Insertion. Anterior sclera

Innervate, oculomotor nerve

Action, depresses, adducts, and rotates eyeball medially

Question 5

Inferior oblique

Answer 5

Origin, floor of orbit

Insertion, sclera deep to lateral rectus muscle

Innervate, oculomotor nerve

Actions, laterally rotates, elevates,and abducts eyeball

Action,

Question 6

Medial rectus

Answer 6

Origin, common tendinous ring

Insertion, anterior sclera

Oculomotor nerve

Adducts eyeball