Neuroanatomy: Cranial Nerves: Iii, Iv And V

Front 1

Cranial nerves III, IV and VI are responsible for ___

Back 1

moving the eye

Front 2

Extraoccular muscles

Back 2

Attach to the eye (there ares six of them)

Front 3

Lateral rectus

Back 3

Moves pupl laterally

Front 4

Medial rectus

Back 4

Moves pupil medially

Front 5

Superior oblique

Back 5

Depression

Front 6

Inferior Rectus

Back 6

Depression

Front 7

Inferior oblique

Back 7

Elevation

Front 8

Superior Rectus

Back 8

Elevation

Front 9

LR6SO4AR3

Back 9

Lateral Rectus (CN VI), Superior Oblique (IV)

Front 10

Number of movements in clinical eye testing

Back 10

6 movements (testing at each location of 6 eteball muscles)

Front 11

Test for lateral rectus

Back 11

Direct pupil laterally

Front 12

Superior rectus

Back 12

Direct pupil laterally then up (stroinger wihen laterally)

Front 13

Inferior rectus

Back 13

Direct pupil laterally then down (stronger when first looking laterally)

Front 14

Medial rectus

Back 14

Medially back to nose

Front 15

Inferior oblique

Back 15

Direct medially then up (Strong elevator when medially)

Front 16

Superio oblique

Back 16

Direct medially then down (string depressor when pupil moved laterally)

Front 17

CN III has two major functions:

Back 17

Skeletal motor and parasympathetic (smooth muscle)

Front 18

Four cranial nerves with parasympathetic function

Back 18

CN IX, X, VII and III

Front 19

Parasympathetic nucleus of CN III

Back 19

Edinger-Westphal

Front 20

CN III also has a ____ nucleus

Back 20

Motor

Front 21

CN III function

Back 21

Distributes to four muscles that move the eye (superior rectus, medial rectus, inferiroi rectus, inferior oblique, Levator palpebrae superior)

Front 22

Lavator palpebrae superioris function

Back 22

To open the eye

Front 23

Lavator palpebrae superioris insertion

Back 23

Upper eyelid

Front 24

Define: Ptosis

Back 24

Drooping of the eyelid due to injury of CN III (CN VII keep sit shut)

Front 25

Upper eyelid also contains _____ muscle and is innervated by ____

Back 25

Smooth; sympathetic portion of ANS

Front 26

Sympathetic lesion may cause _____

Back 26

Partial ptosis (subtle)

Front 27

Parasympathetic component of CN III

Back 27

supplies 2 of 3 intrinsic muscles that change the size of the pupil/shape of the lens (ciliary musclke and sphincter pupillae)

Front 28

Two intrinsic muscles supplied by CN III

Back 28

Sphincter pupillae, ciliaris

Front 29

Function of sphincter pupillae

Back 29

Constriction of pupil

Front 30

Ciliaris

Back 30

Changes the shape of the lens

Front 31

___ is involved in the pupilary light reflex

Back 31

Pupilary light reflex

Front 32

___ is involved with the ciliary light reflex

Back 32

Ciliaris

Front 33

Function of dialtor pupillae

Back 33

Dilates the pupil (innervated by sympathetic system)

Front 34

Direct response

Back 34

Constriction of the same eye that the light is shone in

Front 35

Consensula response

Back 35

Response of the eye that you are not shining the light in

Front 36

Pretectal nuceli

Back 36

Optic nerve connected to it

Front 37

Lesions of third nerve affects

Back 37

Loss of pupillary response

Front 38

Accomodation reflex:

Back 38

Adaptation of visual appearance of the eye for near viision (oblong lens becomes more spherical

Front 39

Which is responsible for cough?

Back 39

Vagus nerve (Q 19)

Front 40

How to test for accomodation reflex

Back 40

Bring object towards face

Front 41

What happens during accomodation reflex?

Back 41

1) Lens rounds up

Front 42

Which nerve is the nerve of accomodation?

Back 42

CN III

Front 43

Lesion of CN III results in

Back 43

Occulomotor opthamoplegia (CN III Palsy)

Front 44

Occulomotor Opthamoplegia results in paralysis of ______

Back 44

4 out of the 6 eye muscles (eye can only abduct and depress)

Front 45

Nerves not affected by OO

Back 45

Lateral rectus and superior oblique

Front 46

Lateral strabismus

Back 46

ASt rest pupil is directd laterally and downward

Front 47

Diplobia

Back 47

Double vision

Front 48

Damage of CN III also results in ____

Back 48

Ptosis of upper eyelid

Front 49

Mydriasis

Back 49

Dilated pupil resulting from damage to CN III

Front 50

Other effect of CN III

Back 50

Pupil will also be unresponsive to light with CN III damage

Front 51

Other effect of CN III

Back 51

Loss of accomodation reflex

Front 52

Causes of CN III damage

Back 52

Head injury, diabetes, anaerysm

Front 53

CN IV is also called the ____

Back 53

trochlear nerve

Front 54

Function of CN IV

Back 54

Innervates the superior oblique

Front 55

Origin of CN IV

Back 55

Tegmentum of midbrtain at level of inferior colliculus

Front 56

One function of medial lingitudinal fasciculus (MLF)

Back 56

interconnects vestibular system of cranial nerves III, IV and VI

Front 57

Vestibular occular reflex (VOR)

Back 57

Reflex set up to maintain stable image when your head is moving back and forth

Front 58

Major function of superior oblique

Back 58

downward and lateral movement of the pupil ("down and out")

Front 59

Paralysis of CN IV may result in

Back 59

Diplobia and weakness of downard gaze (i.e. going down stairs, reading)

Front 60

Patients with CN IV injury may tilt their head because?

Back 60

SO muscle also imparts a rotation to your eye (torsional movements)

Front 61

Rotational movement of the pupil rom CNIV is known as i

Back 61

Intortion

Front 62

CN VI is also called _______

Back 62

Abducens

Front 63

CN VI supplies the _____ muscle

Back 63

lateral rectus

Front 64

Where is the abucens nucleus located?

Back 64

Caudal pons beneat the floor of the fourth ventricle

Front 65

Damage to CN VI casuses ______

Back 65

medial strabismus and diplobia