OUTLINE

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CRANIAL NERVES II BRANCHES OF IX
IX
OUTLINE I. GLOSSO-PHARYNGEAL NERVE II.
HITCHHIKING FIBERS
- review branches of IX - pathways complicated by
hitch-hiking fibers
IX - GLOSSO- PHARYNGEAL
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CRANIAL NERVE CHART TYPES OF NEURONS
Somatic Sensory
Visceral Sensory
Taste, Smell
Branchial muscles
Autonomic
X
VII, IX and X are complex and have a number of
components
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SVE - Special Visceral Efferents - Branchial
Muscles
- motor to voluntary skeletal muscles derived
from branchial arches - visceral because develop
in pharynx then migrate
Third Glosso- pharyngeal IX
First - Trigeminal V
Sixth Accessory XI
Fourth Vagus X
Second - Facial VII
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CRANIAL NERVES I. GVE PARASYMPATHETIC GANGLIA
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GSA - General Somatic Afferents
sensory to skin, ORAL cavity, NASAL cavity,
joints, muscles
ALMOST ALLTRIGEMINAL VEXCEPTIONSKIN OF OUTER
EARALSO1) VII- FACIAL2) IX -
GLOSSO- PHARYNGEAL3) X - VAGUS
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GVA - General Visceral Afferents
Sensory to Pharynx and derivatives
All Pharynx is GVA In 3 Cranial Nerves
Nasal Cavity GSA
NASOPHARYNX - VII
Oral Cavity GSA
OROPHARYNX - IX
LARYNGOPHARYNX - X
IX Also provides GVA touch to post. 1/3 of
tongue
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SVA - Special Visceral Afferents
Chemical Sense - TASTE - in three cranial nerves
X - VAGUS - ant. to epiglottis IX -
GLOSSO- PHARYNGEAL post. 1/3 of tongue VII -
FACIAL - ant. 2/3 of tongue
TONGUE
IX - SVA taste and GVA touch to post. tongue
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BRANCHES OF IX HITCHHIKE WITH BRANCHES OF V
Recall
Recall
Trigeminal V Receives hitchhiking fibers from
Facial VII and Glossopharyngeal IX
CN XII Receives hitchhiking fibers from C1
example
V3 Lingual
VII Chorda Tympani
Parasympathetics from IX also hitchhike with a
branch of Trigeminal Auriculotemporal nerve (V3)
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PARASYMPATHETICS AND TASTE FIBERS OF VII AND IX
JOIN BRANCHES OF V
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IX - GLOSSOPHARYNGEAL
leaves Post. Cranial fossa via Jugular Foramen
IX
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IX - GLOSSOPHARYNGEAL
NOSE
exits via Jugular Foramen
Lesser Petrosal N.
Tympanic N.
1. Tympanic Nerve Forms tympanic plexus GVA
sensory to middle ear Mastoid sinus auditory tube
Auditory tube
IX
2. Lesser Petrosal GVE parasymp To Parotid Gland
exits via Jugular Foramen
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IX- LESSER PETROSAL NERVE - PAROTID GLAND
Lesser Petrosal N.
IX Lesser Petrosal synapse in Otic
Ganglion Post. ganglionic parasymp. from Otic
ganglion join Auriculo temporal N. V 3 -to
Parotid Gland May also carry GSA fibers to outer
ear
Otic Ganglion
Auriculo Temporal N. V 3
Parotid Gland
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IX - GLOSSOPHARYNGEAL
3. Carotid branches Sensory Carotid sinus -
blood Pressure Carotid Body - CO2 in blood 4.
Motor Nerve to Stylopharyngeus 5. Pharyngeal
Branches Sensory to oropharynx 6. Tonsillar
Branches Sensory to palatine tonsil 7. Lingual
branches Sensory (touch) taste to post. 1/3 of
tongue
Motor Nerve to Stylopharyngeus
Tympanic
Tonsillar
Lingual
Carotid
Pharyngeal br
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PARASYMPATHETIC OF IX JOIN BRANCHES OF V
IX LESSER PETROSAL OTIC GANGLION
AURICULO- TEMPORAL NERVE
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INTEGRATION REVIEW
GAG REFLEX
Carotid
Pharyngeal branches
IX GAG REFLEX IN - IX (Pharyngeal Sensory
branches) OUT - X
IX CENTRAL LESIONS Nucleus solitarius - GVA--
9,10 cardiac-pulmonary areflexia loss of
chemo-baro-sensory afferents in the carotid
sinus/body (Carotid branch IX)