movements of the eye

Question 1

innervation of the extraocular muscles and the eye

Answer 1

“LR6SO4A03” lateral rectus CNVI, sup oblique CNIV, all other CNIII

Question 2

optic nerve

Answer 2

CNII, special sensation or sight for the eye

Question 3

motor nerves to eye from midbrain (2)

Answer 3

oculomotor: sup: levator palpebral, sup rectus, med rectus inf: inf oblique, inf rectus trochlear CNIV: motor to superior oblique

Question 4

motor to eye from pons (1)

Answer 4

abducens nerve, CN VI. Motor to lateral rectus

Question 5

opthalmic? branches?

Answer 5

sensory to eye. Branches: 1. frontal: divides into supratrochlear and supraorbital 2. lacrimal: to the lacrimal gland 3. nasociliary: to the nose, ethmoidal sinuses, and long ciliary branches to the cornea. corneal reflex

Question 6

ciliary ganglia

Answer 6

associated with short ciliary nerves. Preganglionic parasymp. fibers from CNIII synapse here and constrict the pupil and accommodate the lens

Question 7

extraocular muscles (6)

Answer 7

sup and inf rectus: elevate and depress the eye med/lat rectus: ad/abduct, insert onto ant. schlera of the eye sup/inf oblique muscles:up/down and out, insert onto post schlera

Question 8

levator palpebrae

Answer 8

elevates the eyelid occulomotor of CNII sup division Lesion would cause drooping of upper lid

Question 9

superior rectus

Answer 9

pulls eye up and slightly medial. Occulomotor nerve, sup division

Question 10

inf rectus

Answer 10

pulls eye down and medial occulomotor CNIII inferior division

Question 11

Medial rectus

Answer 11

moves eye medially toward nose, adducts eye. occulomotor nerve superior division

Question 12

lat rectus

Answer 12

abducts the eye, lateral gaze abducens CNVI

Question 13

sup oblique

Answer 13

moves eye down and out trochlear nerve

Question 14

inf oblique

Answer 14

moves eye up and out occulomotor inferior division

Question 15

Z axis of movement

Answer 15

ad/abduction lateral (ab) and medial (ad) rectus

Question 16

X axis of movement

Answer 16

elevation/depression sup rectus (elevate), inf rectus (depress)

Question 17

Y axis of movement

Answer 17

extorsion and intorsion sup oblique (intorts) (depression and abduction) inf oblique (extorts) (elevates and abducts)

Question 18

looking to the right

Answer 18

lat rectus of the right would abduct and the med rectus of the left would adduct

Question 19

looking up and out

Answer 19

inf oblique is active on the outer eye. SR looks up and in for the opposite eye.

Question 20

looking down and out

Answer 20

SO prime mover for outer eye, IR would look down and in for the other eye

Question 21

looking straight up

Answer 21

combo of action of the SR and the IO on both eyes

Question 22

straight down

Answer 22

combo of sup oblique and IR for both eyes

Question 23

diplopia

Answer 23

double vision, common symptom of eye muscle problems

Question 24

strabismus

Answer 24

lat or med. The eye cant move to the side of the lesion. Could be pulled in the opposite direction by the muscle that is not lesioned

Question 25

ptosis

Answer 25

drooping of the upper eyelid

Question 26

oculomotor lesion

Answer 26

double vision, lateral strabismus-the eye cannot move medially. Ptosis. Loss of constriction or accomidation due to loss of parasymp. fibers with the oculomotor nerve

Question 27

trochlear lesion

Answer 27

double vision, weak downward gaze, has to tilt head to go down steps. Sup only, down and out

Question 28

Abducens lesion

Answer 28

double vision, medial strabismus. eye cannot move laterally, stuck medially. abductor, lat rectus.