Cranial Nerve Nuclei

Question 1

II

Answer 1

Optic Nerve = Optic Tract
(sensory)
follows the optic chiasm

LGN

pretectal nucelus (pupillary reflex)

Question 2

III

Answer 2

Oculomotor Nerve = Oculomotor nucleus
(motor) ipsalateral

Edinger-Westphal nucleus

midline, just below (caudal) to mammilary bodies

Question 3

IV

Answer 3

Trochlear Nerve = Trochlear Nucleus
(motor)

midline, caudal to oculomotor tract – inferior colliculus

CONTRALATERAL

Question 4

V

Answer 4

Motor = Motor Nucleus(V)
Sensory = mesencephalic Nucleus (V) (located in/on pons) + spinal nucleus and tract+ main sensory nucelus

Question 5

VI

Answer 5

abducens nerve (motor) also on pons

Question 6

VII

Answer 6

Facial nucleus REMAINS IPSILATERAL

Question 7

VIII

Answer 7

vestibular nuclei, crossing over into medulla

anterior/posterior cochlear nuceli

Question 8

IX

Answer 8

motor: nucleus ambiguous
sensory: solitary tract nucelus

ipsilateral

Question 9

X

Answer 9

Motor: nucleus ambiguous + dorsal motor nucelus (parasympathetic)
sensory: ? maybe solitary tract nucleus

Question 10

XI

Answer 10

spinal nucleus accessory nerve

Question 11

XII

Answer 11

hypoglossal nucleus (motor)

Question 12

coronal cranial nuclei

Answer 12

Question 13

saggital cranial nuclei

Answer 13

Question 14

I

Answer 14

Olfactory bulb

Question 15

General ipsalateral/contralateral

Answer 15

generally, things dessicate (CNS).

not true in brain stem.

There are exceptions of course

Question 16

Reticular Formation

Answer 16

extends from cord to thalamus

those in midline refered to as Raphe, contain serotonin

Locus coeruleus biggest collection of norepinephrine cells

In Medulla involved in respiration and cardiovascular, blood
pressure, muscle tone and pain modulation

In Pons involved in respiration, muscle tone, micturition,
sleep/wake/dream cycle, coord head and body

In Midbrain involved in arousal, attention

Central pattern generators for automated movements: chewing,
locomotion, eye-head-body coordination, sympathetic integration,
voluntary movement,

Question 17

Gag Reflex

Answer 17

Question 18

Corneal reflex

Answer 18

Question 19

Pupillary Reflex

Answer 19

Question 20

Vestibulurocular Reflex

Answer 20

Fun factoid: CV IV innervates
contralateral muscle!

Question 21

medial longitudinal fasciculus

Answer 21

Question 22

MLF Damage

Answer 22

Question 23

location of Edinger-Westphal nucleus

Answer 23

midbrain – superior colliculus

Question 24

function of Edinger-Westphal nucleus

Answer 24

pupil contraction, lens accommodation