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4
Abducens Nucleus(eye muscle motoneurons)
Facial nerve fibers(looping around the abducens nucleus)
Facial motor nucleus(muscles of
facial expression)
Facial motor nucleus
5
Solitary tract(inside)
Solitary nucleus(outside)
Spinal trigeminalnucleus
Abducensnucleus
Superior salivatory nucleus
Facial intermediate nervepart of facial nerve carrying:Motor1) motor output from the superior salivatory nucleusto some salivary glands (GVE)Sensory1) taste information fromthe anterior 2/3 of the tongue tosolitary nucleus via the solitarytract (SVA)2) touch information from asmall patch of skin on the ear andbehind the ear to spinal trigeminalnucleus (GSA)Facial
intermediatenerve
6
Vestibulocochlear Nerve VIIICochlear component
(carries auditory signals from thecochlea to the cochlear nucleus)
Superior cochlear nucleus
Superior cerebellar peduncle
Inferior cerebellar peduncle
Middle cerebellar peduncle
Spinocerebellar fibers(on route to the cerebellum)
7
Vestibulocochlear Nerve VIIIvestibular component
(carries vestibular signals from thevestibular labyrinth to the vestibular nuclei)
Inferiorvestibularnucleus
Medialvestibularnucleus
InferiorCerebellarpeduncle
9
Mediallemniscus
SpinothalamicTract
PyramidalTract
Spinal trigeminalnucleus & tract
HypoglossalNucleus
Inferior olive
nucleus
Vestibularnuclei
Abducensnerve
(to eye muscle)
Cochlear Nucleus(auditory information)
MLF
PontineGray matter
(relay signals to cerebellum)
Inferior cerebellarpeduncle
(spinocerebellarfibers to cerebellum)
Solitary tract& nucleus
10
Nucleus Ambiguus(motoneurons forlarynx & pharynx
muscles)
Glossopharyngeal nerve IXcarries:Motor1) signals to the pharynxfrom nucleus ambiguus2) motor output from the inferiorsalivatory nucleus to some salivaryglandsSensory1) taste information from posterior1/3 of tongue to the solitary nucleusvia the solitary tract.2) touch information from the posterior 1/3 of the tongue, pharynx, some skin around the ear, internal surface of ear drumto the spinal trigeminal tract3) Pressure signals from the carotidartery
Solitary nucleus & tract
Spinal trigeminal Nucleus
Inferior salivatory nucleus
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Solitarynucleus & tract
Nucleusambiguus
Spinaltrigeminalnucleus
Dorsalmotor nucleusof the Vagus
Roots of the vagus nerve X carries:Motor1) motor signals to larynx & pharynx muscles from motoneurons in nucleus ambiguus.2) parasympathetic output to the larynx & pharynx & to organs of the chest & abdomen from the dorsal motor nucleus of the vagusSensory1) touch signals from pharynx, external ear canal, external side of the ear drum, & skin of the earto the spinal trigeminal nucleus.2) taste information from the epiglottus to the solitary nucleus3) sensory signals from the larynx, trachea, esophagus, chest & abdomen viscera, & pressure & chemoreceptorsin the aorta to the caudal part of the solitary nucleus.
12
Medial lemniscus(touch information
from body)
SpinothalamicTract
SpinocerebellarTract
Pyramids
Spinal trigeminalnucleus & tract
HypoglossalNucleus(tongue
motoneurons)
Lateralcuneatenucleus
Inferior olive nucleus(big input to cerebellum)
Vestibularnuclei
Hypoglossal nerve(motor commands to tongue)
MLF
DMX
Nucleus Ambiguus(motoneurons for larynx
& pharynx muscles)Solitary tract
& nucleus
Vagus Nerve Rootlet(motor commandsto viscera in body)
13
Spinalaccessory
nerve
Spinal accessory nucleus(motoneurons for
sternocleidomastoid & trapezius muscles)
Spinalaccessory
roots
14
Cuneate fasciculus
Pyramidal DecussationSpinothalamic
TractPyramidal tract
Spinaltrigeminal
nucleus & tract
Cuneate nucleusGracile Nucleus
Gracile fasciculus
MLF
Spinal AccessoryNucleus
15
Hypoglossalnerve
Hypoglossal nuclei(motoneuron fortongue muscles)
Dorsal motor nucleiof the vagus
Solitarynucleus& tract
Spinal trigeminalnucleus & tract
Nucleusambiguus
Vestibularnuclei
External cuneatenucleus
Inferior olive
Pyramidaltract
16Medial lemniscus
Spinal trigeminalnucleus & tract
HypoglossalNucleus
Lateral cuneatenucleus
IVthventricle
Vestibularnuclei
DMX
Solitary tract& nucleus
Inferior olive
Pyramidal tract
17
Trochlearnerve
Trochlearnucleus
Oculomotornucleus
Oculomotornerve
Abducensnucleus
Abducensnerve
Hypoglossalnucleus
Hypoglossalnerve
Somatic Motor Nuclei
18
Trigeminalmotor nucleus
Trigeminalnerve
Facialmotor nucleus
Facialmotor nerve
Nucleusambiguus
Nucleus ambiguusaxons bound for
glossopharyngeal& vagus nerves
Special visceral (Branchial) Motor Nuclei
19
Dorsal motor nucleus of the vagus
Edinger-Westphalfibers bound for
the oculomotor nerve
Axons from the dorsal motor nucleusof the vagus bound for the vagus nerve
Axons from the inferiorsalivatory nucleus bound
for the glossopharyngeal nerve
Inferior salivatory nucleus
Superior salivatory nucleus
Axons from thesuperior salivatory nucleusbound for the facial nerve
General Visceral Motor Nuclei
Edinger-Westphalnucleus
20
Spinaltrigeminal
nerve
Spinaltrigeminalnucleus
Mesencephalictrigeminal nucleus
Main sensorytrigeminal nucleus Mesencephalic
trigeminal tractTrigeminal nerve
(touch, conscious& unconscious proprioception, pain & temperature
from the head to main sensorytrigeminal nucleus, mesencephalic
trigeminal nucleus & spinaltrigeminal nucleus)
Vagus nerve(touch from ear
& pharynx tospinal trigeminal)
GlossopharyngealNerve
(touch from ear & pharynxto spinal trigeminal)
Facial intermediate nerve(touch from ear to spinal
trigeminal nucleus)
Somatic Sensory Nuclei
Glossopharyngeal nerve (taste from posterior 1/3
of tongue to solitary nucleus)
Facial intermediateNerve (taste from anterior2/3 of tongue to solitary
nucleus)
Vagus nerve(taste from epiglottus to rostral solitary nucleus,
signals from the trachea, esophagus,chest, abdomen & aorta to
caudal part of solitary nucleus)
Visceral Sensory Nuclei
GENICULATEGANGLION
PETRO SALGANGLIO N
SOLITARYNUCLEUS
C aud a l 1 /2(au to nom ic sen sory
processing)(GVA)
NODO SEGANGLIO N
P O S TE R IO R 1/3
R ostra l 1 /2(tas te )(SVA)
TONGUE
A N T E R IO R 2/3
E P IG LO T TIS
V II - FA C IA L
IX - G L O S S O P H A R Y N G E A L
X - VA G U S
( fac ia lin te rm e d ia te
nerve)