Extraocular muscles

Question 1

superior rectus

Answer 1

origin: Superior part of common tendinous ring
insertion: Sclera - anterior half of eyeball superiorly
action: Elevation, adduction and internal rotation
innervation: oculomotor nerve

Question 2

inferior rectus

Answer 2

origin: inferior part of common tendinous ring
insertion: sclera- inferiorally
action: depression, adduction and lateral rotation
innervation: oculomotor nerve

Question 3

medial rectus

Answer 3

origin: medial- common tendinous ring
insertion: sclera- medially
action: adduction
innervation: oculomotor nerve

Question 4

lateral rectus

Answer 4

origin: lateral- common tendinous ring
insertion: sclera- laterally
action: abduction
innervation: abducens nerve

Question 5

superior oblique

Answer 5

origin: body of sphenoid, superior and medial to optic canal
insertion- outer post aspect of superior surface
action : depression, abduction, internal rotation
innervation: trochlear nerve

Question 6

inferior oblique

Answer 6

origin: medial floor of orbit, maxilla
insertion: sclera- outer posterior aspect of inferior surface
action: elevation, abduction and external rotation
innervation: oculomotor nerve

Question 7

levator palpebrae superioris

Answer 7

origin: lesser wing of sphenoid bone anterior to optic canal
insertion: tarsal plate, upper
action: elevation of eyelid
innervation: oculomotor nerve