Cranial Nerve Nuclei Flashcards
II
Optic Nerve = Optic Tract
(sensory)
follows the optic chiasm
LGN
pretectal nucelus (pupillary reflex)
III
Oculomotor Nerve = Oculomotor nucleus
(motor) ipsalateral
Edinger-Westphal nucleus
midline, just below (caudal) to mammilary bodies
IV
Trochlear Nerve = Trochlear Nucleus
(motor)
midline, caudal to oculomotor tract – inferior colliculus
CONTRALATERAL
V
Motor = Motor Nucleus(V) Sensory = mesencephalic Nucleus (V) (located in/on pons) + spinal nucleus and tract+ main sensory nucelus
VI
abducens nerve (motor) also on pons
VII
Facial nucleus REMAINS IPSILATERAL
VIII
vestibular nuclei, crossing over into medulla
anterior/posterior cochlear nuceli
IX
motor: nucleus ambiguous
sensory: solitary tract nucelus
ipsilateral
X
Motor: nucleus ambiguous + dorsal motor nucelus (parasympathetic)
sensory: ? maybe solitary tract nucleus
XI
spinal nucleus accessory nerve
XII
hypoglossal nucleus (motor)
coronal cranial nuclei
saggital cranial nuclei
I
Olfactory bulb
General ipsalateral/contralateral
generally, things dessicate (CNS).
not true in brain stem.
There are exceptions of course
Reticular Formation
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,
Gag Reflex
Corneal reflex
Pupillary Reflex
Vestibulurocular Reflex
Fun factoid: CV IV innervates
contralateral muscle!
medial longitudinal fasciculus
MLF Damage
location of Edinger-Westphal nucleus
midbrain – superior colliculus
function of Edinger-Westphal nucleus
pupil contraction, lens accommodation
