Muscles of the Head that Move the Eyeballs ( Extrinsic) and Upper Eyelids

Question 1

Superior rectus

Answer 1

Origin-common tendinous ring [attached to orbit around optic foramen]

Insertion-superior and central part of eyeballs

Action-moves eyeball superiorly [elevation] and medially [adduction], and rotate them medially

Innervation- Oculomotor [ III] nerve

Question 2

Inferior rectus

Answer 2

Origin-common tendinous ring [attached orbit around optic foramen]

Insertion-inferior in central part of eyeballs

Action-moves eyeballs inferiorly [depression] and medially [adduction], and rotates them laterally

Innervation- oculomotor [ III] nerve

Question 3

Lateral rectus

Answer 3

Origin-common tendinous ring [attached orbit around optic foramen]

Insertion-lateral side of eyeballs

Action-moves eyeballs laterally [abduction]

Innervation-abducens [ VI] nerve

Question 4

Medial rectus

Answer 4

Origin-common tendinous ring [attached orbit around optic foramen]

Insertion- medial side of eyeballs

Action-move the eyeballs medially [adduction]

Innervation- oculomotor [III] Nerve

Question 5

Superior oblique

Answer 5

Origin- sphenoid bone, Superior and medial to common tendinous ring in orbit

Insertion-eyeball between superior and lateral recti. Muscle inserts into superior and lateral surface of eyeball via tendon that passes through trochlea

Action – moved eyeballs inferiorly [depression] and laterally [abduction], and rotate them medially

Innervation- trochlear [ VI] nerve

Question 6

Inferior oblique

Answer 6

Origin-maxilla in floor of orbit

Insertion- eyeballs between inferior and lateral recti

Action-moves eyeballs superiorly [elevation] and laterally [abduction], and rotates them laterally

Innervation-oculomotor [ III] nerve

Question 7

Levator palpebrae Superioris

Answer 7

Origin-roof of orbit [lesser wing of sphenoid bone]

Insertion-skin and tarsal plate of upper eyelids

Action-elevate upper eyelids [open the eyes]

Innovation-oculomotor [ III] nerve