Vision: Eye Muscles

Question 1

what do intrinsic muscles control?

Answer 1

pupil diameter and lens curvature

Question 2

what do extrinsic eye muscles do?

Answer 2

move the eyeball

Question 3

where do recti eye muscle arise from?

Answer 3

the apex of the eye

Question 4

where does the superior oblique muscle arise from?

Answer 4

the roof of the orbit posteriorly

Question 5

where does the inferior oblique muscle arise from?

Answer 5

the floor of the orbit anteriorly

Question 6

what is the muscle of the eyelid called?

Answer 6

levator palpebrae superioris

Question 7

where to the recti muscles insert into?

Answer 7

the sclera anteriorly

Question 8

what does the trochlear nerve supply?

Answer 8

the superior oblique

Question 9

what does the abducent nerve supply?

Answer 9

the lateral rectus muscle

Question 10

what does the oculomotor nerve supply?

Answer 10

the levator palpebrae superioris, medial rectus, superior rectus, inferior rectus and inferior oblique

Question 11

in terms of uniocular eye movement what is looking away from the nose called?

Answer 11

abduction

Question 12

what is adduction in uniocular eye movement?

Answer 12

the eye looking towards the nose

Question 13

what is intorsion?

Answer 13

when the top of the eye rotates towards your nose (rotating your head)

Question 14

what is extorsion?

Answer 14

when the top of your eye rotates away from the nose (rotating your head)

Question 15

what axis are the eye muscles attached along?

Answer 15

the orbital axis not the optical axis (so muscles will have more than one action on the eyeball)

Question 16

what is the effect of the oblique’s being inserted to the back of the eyeball?

Answer 16

they pull the posterior part of the eyeball up/down causing the opposite effect on the anterior part. superior oblique depresses the eye. inferior oblique elevates the eyeball.

Question 17

what the lateral rectus has abducted the eye what is the effect of the superior rectus?

Answer 17

elevation

Question 18

what the lateral rectus has abducted the eye what is the effect of the inferior rectus?

Answer 18

depression

Question 19

when will the superior rectus cause intorsion?

Answer 19

when the medial rectus has adducted the eye

Question 20

when will the inferior rectus cause extorsion?

Answer 20

when the medial rectus has adducted the eye

Question 21

what is the effect of the superior oblique when the eyeball is adducted?

Answer 21

depression

Question 22

what is the effect of the superior oblique if the eye is abducted?

Answer 22

intorsion

Question 23

when will the inferior oblique cause elevation?

Answer 23

when the eyeball is adducted

Question 24

when will the inferior oblique cause extorsion?

Answer 24

when the eyeball is abducted

Question 25

where is the ciliaris muscle?

Answer 25

In the ciliary body

Question 26

where is the constrictor pupillae?

Answer 26

in the iris at the pupillary border

Question 27

where is the dilator pupillae?

Answer 27

running radially in the iris

Question 28

what intrinsic eye muscles are innervated by the parasympathetic system?

Answer 28

ciliaris muscle and constrictor pupillae

Question 29

what intrinsic muscle is innervated by the sympathetic system?

Answer 29

dilator pupillae