CN function

Question 0

Consensual Reaction

Answer 0

constriction of the opposite eye in response to illumination in one eye. Due to bilateral input to pretectal region and edinger-westpahl nucleus

Question 1

Strabismus

Answer 1

misalignment of the eyes

Question 2

myopia

Answer 2

near-sighted

Question 3

amblyopia

Answer 3

“wandering eye” due to muscle weakness or poor vision in one eye. The patient does NOT see double because the brain ‘shut off’ the bad input.

Question 4

Monocular vision problem are due to lesion anterior/at/posterior to the optic chiasm

Answer 4

anterior

Question 5

homonymous problems are due to lesion anterior/at/posterior to the optic chiasm

Answer 5

posterior

Question 6

bitemporal hemianopsia is due to a lesion located :

Answer 6

at the optic chiasm

Question 7

Myers loop is

Answer 7

the optic radiations of the upper visual field which pass from the thalamus to the occipital lobe via the temporal lobe.

Question 8

When passing from the thalamus to the occipital lobe, the optic radiations of the lower visual world pass through:

Answer 8

Parietal lobe

Question 9

The Paramedian Pontine reticuar formation is a center for

Answer 9

Lateral gaze

Question 10

what type of gaze is accomplished by diffuse cerebral cortical function as well as rostral midbrain and pretectal areas

Answer 10

Vertical Gaze

Question 11

Ptosis may be caused by

Answer 11

weakness of levator palpebrae (CNIII damage)

Question 12

Horner’s syndrome =?

Is caused by

Answer 12

Ptosis, meiosis, anhydrosis.
Causes by damage to the oculosympathetic pathway;
neuron 1 - hypothalamus to lateral horn of SC at T1
neuron 2 - into the superior cervical ganglion
neuron 3 - to the sweat glands of frehead, face, ito the opthalmic division of trigeminal to the long cilliary nerve (pupillary dilator), to smooth muscle of eyelid. runs along external carotid.

Question 13

_______ fibers are responsible for dilating the pupil

Answer 13

sympathetics

Question 14

______ fibers are responsible for constricting to light and accommodation and travel in CN _____

Answer 14

parasympathetic

CN III

Question 15

The area of the midbrain responsible for mediating the pupillary light reflex is the

Answer 15

pretectum

Question 16

hyperacusis and loss of taste in the anterior 2/3 of tounge might come from damage to CN___

Answer 16

VII

Question 17

Damage to CN____ will produce sensorineural hearing loss.

Answer 17

VIII

Question 18

T/F: Hearing can be damaged by lesions to the brain.

Answer 18

True?

Question 19

Webers test lateralizes ____ the side of conductive loss and ____ the side of sensorinueral loss.

Answer 19

toward conductive

Away from neural

Question 20

CN ___ provides sensation to the carotid baroreceptor, chemoreceptor, the pharynyx, and middle ear.

Answer 20

IX, 9

Question 21

CN ___ eevates the soft palate

Answer 21

10

Question 22

Corneal reflex:
afferent -
efferent -

Answer 22

a - V1

e - VII

Question 23

lacrimation reflex:
afferent -
efferent -

Answer 23

a- V1

e - VII

Question 24

Jaw jerk reflex afferent - efferent -

Answer 24

V3 (muscle spindle of masseter) V3 (motor of masseter) Remember, V3 is the only division of the trigeminal with both motor and sensation.. V1 + V2 are just sensory.

Question 25

pupilllary reflex aferrent - efferent -

Answer 25

a- II | e - III

Question 26

gag reflex aferrent - eferrent -

Answer 26

a - IX | e - X