Extraocular Muscles (extrinsic muscles) - move superior eyelid and eyball

Question 1

What are the Extraocular Muscles?

Answer 1

Superior Rectus, Medial Rectus, Lateral Rectus, Inferior Rectus, Superior Oblique, Inferior Oblique, Levator Palpebrae Superioris

Question 2

What is the origin of the Superior Rectus muscle?

Answer 2

common tendinous ring

Question 3

What is the insertion of the Superior Rectus muscle?

Answer 3

sclera of eyeball

Question 4

What is the innervation of the Superior Rectus muscle?

Answer 4

CN III oculomotor nerve

Question 5

What is the blood supply of the Superior Rectus muscle?

Answer 5

ophthalmic artery

Question 6

What is the action of the Superior Rectus muscle?

Answer 6

rotate pupils superiorly and medially

Question 7

What is the origin of the Medial Rectus muscle?

Answer 7

common tendinous ring

Question 8

What is the insertion of the Medial Rectus muscle?

Answer 8

sclera of eyeball

Question 9

What is the innervation of the Medial Rectus muscle?

Answer 9

CN III oculomotor nerve

Question 10

What is the blood supply of the Medial Rectus muscle?

Answer 10

ophthalmic artery

Question 11

What is the action of the Medial Rectus muscle?

Answer 11

rotate the pupils medially

Question 12

What is noteworthy about the Medial Rectus muscle?

Answer 12

opposes Lateral Rectus muscle

Question 13

What is the origin of the Lateral Rectus muscle?

Answer 13

common tendinous ring

Question 14

What is the insertion of the Lateral Rectus muscle?

Answer 14

sclera of eyeball

Question 15

What is the innervation of the Lateral Rectus muscle?

Answer 15

CN VI abducent nerve

Question 16

What is the blood supply of the Lateral Rectus muscle?

Answer 16

ophthalmic artery

Question 17

What is the action of the lateral rectus muscle?

Answer 17

rotate pupils laterally

Question 18

What is noteworthy about the lateral rectus muscle?

Answer 18

loss of function will cause eye to be abducted

Question 19

What is the origin of the Inferior Rectus muscle?

Answer 19

common tendinous ring

Question 20

What is the insertion of the Inferior Rectus muscle?

Answer 20

sclera of eyeball

Question 21

What is the innervation of the Inferior Rectus muscle?

Answer 21

CN III oculomotor nerve

Question 22

What is the blood supply of the Inferior Rectus muscle?

Answer 22

ophthalmic artery

Question 23

What is the action of the Inferior Rectus muscle?

Answer 23

rotate pupils inferiorly and medially

Question 24

What is the origin of the Superior Oblique muscle?

Answer 24

apex of orbit above optic canal

Question 25

What is the insertion of the Superior Oblique muscle?

Answer 25

sclera of eyeball

Question 26

What is the innervation of the Superior Oblique muscle?

Answer 26

CN IV trochlear nerve

Question 27

What is the blood supply of the Superior Oblique muscle?

Answer 27

ophthalmic artery

Question 28

What is the action of the Superior Oblique muscle?

Answer 28

abducts, depresses and rotates pupils laterally

Question 29

What is noteworthy about the Superior Oblique muscle?

Answer 29

passes through the trochlea (pulley)

Question 30

What is the origin of the Inferior Oblique muscle?

Answer 30

floor of orbit lateral to lacrimal groove

Question 31

What is the insertion of the Inferior Oblique muscle?

Answer 31

sclera of eyeball

Question 32

What is the innervation of the Inferior Oblique muscle?

Answer 32

CN III oculomotor nerve

Question 33

What is the blood supply of the Inferior Oblique muscle?

Answer 33

Ophthalmic artery

Question 34

What is the action of the Inferior Oblique muscle?

Answer 34

abducts, elevates and rotates pupils laterally

Question 35

What is the origin of the Levator Palpebrae Superioris muscle?

Answer 35

apex of orbit above optic canal

Question 36

What is the insertion of the Levator Palpebrae Superioris muscle?

Answer 36

skin and fascia of upper eyelid

Question 37

What is the innervation of the Levator Palpebrae Superioris muscle?

Answer 37

CN III oculomotor nerve

Question 38

What is the blood supply of the Levator Palpebrae Superioris muscle?

Answer 38

ophthalmic artery

Question 39

What is the action of the Levator Palpebrae Superioris muscle?

Answer 39

elevates superior eyelid