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OUTLINE
I. GLOSSO-PHARYNGEAL NERVEII. HITCHHIKING FIBERS
GLOSSOPHARYNGEAL NERVE (IX)
IX - GLOSSO-PHARYNGEAL
- review branches of IX- pathways complicated by hitch-hiking fibers
IX
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VII, IX and X are complex and have a number of components
CRANIAL NERVE CHART: TYPES OF NEURONS
X
Branchialmuscles
Visceral motor =Autonomic
SomaticSensory
VisceralSensory
Taste,Smell
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Branchial Motor (SVE - Special Visceral Efferents)
- motor to voluntary skeletal muscles derived from branchial arches- visceral because develop in pharynx then migrate
Second -Facial VII
ThirdGlosso-pharyngealIX
First -TrigeminalV
FourthVagusX
SixthAccessoryXI
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Somatic Sensory (GSA - General Somatic Afferents)sensory to skin, ORAL cavity, NASAL cavity, joints, muscles
ALMOST ALLTRIGEMINAL VEXCEPTION:SKIN OF OUTER EARALSO1) VII- FACIAL2) IX - GLOSSO-PHARYNGEAL3) X - VAGUS
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Nasal CavityGSA
Oral CavityGSA
Sensory to Pharynx and derivatives
All Pharynx is GVAIn 3 Cranial Nerves
NASOPHARYNX - VII
OROPHARYNX - IX
LARYNGOPHARYNX - X
IX – Also provides GVA touch to post. 1/3 of tongue
Visceral Sensory (GVA - General Visceral Afferents)
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TASTE - (SVA - Special Visceral Afferents)Chemical Sense - TASTE - in three cranial nerves
X - VAGUS -ant. to epiglottis
IX - GLOSSO-PHARYNGEALpost. 1/3 of tongue
VII - FACIAL -ant. 2/3 of tongue
TONGUE
IX - SVA taste andGVA touch to post. tongue
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CN XII Receives hitchhiking fibers from C1
BRANCHES OF IX HITCHHIKE WITH BRANCHES OF V
Trigeminal V Receives hitchhiking fibers from Facial VII and Glossopharyngeal IX
VIIChordaTympani
V3 Lingual
example:
Parasympathetics from IX also hitchhike with a branch of Trigeminal: Auriculotemporal nerve (V3)
Recall: Recall:
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LesserPetrosal N.
exits viaJugular Foramen
1. Tympanic NerveForms tympanic plexus; GVA sensory to middle earMastoid sinusauditory tube
2. Lesser PetrosalGVE parasympTo Parotid Gland
Tympanic N.
IX
IX - GLOSSOPHARYNGEALNOSE
exits viaJugular Foramen
Auditorytube
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IX Lesser Petrosal –synapse in OticGanglionPost. ganglionic parasymp. from Oticganglion join Auriculotemporal N. V 3 - to Parotid Gland
May also carry Somatic Sensory (GSA) fibers to outer ear
Lesser Petrosal N.
AuriculoTemporalN. V 3
IX- LESSER PETROSAL NERVE - PAROTID GLAND
Parotid Gland
Otic Ganglion
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3. Carotid branchesSensory –Carotid sinus - blood PressureCarotid Body - CO2 in blood
4. Motor Nerve to Stylopharyngeus
5. Pharyngeal BranchesSensory to oropharynx
6. Tonsillar BranchesSensory to palatine tonsil
7. Lingual branchesSensory (touch) & taste to post. 1/3 of tongue
Tonsillar
Lingual
Pharyngeal br
Carotid
Tympanic
IX - GLOSSOPHARYNGEALMotor Nerve to Stylopharyngeus
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PARASYMPATHETIC OF IX JOIN BRANCHES OF V
AURICULO-TEMPORALNERVE
IX – LESSERPETROSAL – OTICGANGLION