CN IX Flashcards
What muscle does CN IX innervate
stylopharyngeous
CN IX has what type of fibers
Motor, sensory, autonomic
making it a mixed nerve
where do the motor fibers arise from in the glossopharyngeal n.
superior part of the nucleus ambiguous
CN IX: Preganglionic parasympathetic fibers arise from
inferior salivatory nucleus
CN IX: Sensory afferent fibers terminate in
Solitary nucleus
What are the 2 ganglion associated with CN IX
Superior ganglion (smaller) inferior ganglion (larger)
Origin of glossopharyngeal nerve
superior lateral aspect of the medulla oblongata
CN IX exits the skull via
jugular foramen
CN IX exits posterior to what
septum
Where do motor fibers carried in CN IX arise from?
nucleus ambiguous
Preganglionic parasympathetic arise from
inferior salivatory nucleus
Sensory fibers terminate where
solitary nucleus
What are the 2 peripheral ganglion associated with CN IX
superior and inferior ganglion
information conveyed to the CNS synapse where
spinal nucleus of trigeminal nerve CN V
Taste info posterior to sulcus terminalis is carried in the inferior ganglion and synapses where
Superior part of the solitary nucleus
Visceral afferent info from carotid sinus and body carried in the inferior ganglion to synapse where
inferior part of solitary nucleus
Nucleus ambiguous innervates what nerves
IX, X, and XI
Postganglionic Parasympathetic fibers synapse where
otic ganglion
Postganglionic parasympathetic fibers supply partoid, buccal, and
inferior labial glands
What is the apparent origin of CN IX
superior aspect of MO
Where does CN IX exit
Jugular foramen
Where is superior and inferior ganglion located
superior: inside cranium
inferior: beyond jugular foramen, outside cranium
What arises from the inferior ganglion?
tympanic nerve
What does the tympanic nerve carry
preganglionic parasympathetic and sensory fibers
tympanic nerve splits off the inferior ganglion and fibers are carried through what
tympanic canaliculus
after tympanic nerve fibers pass through tympanic canaliculus what do they go into
tympanic cavity
tympanic nerve receives postganglionic SYMPATHETIC fibers from
superior cervical ganglion
What is the path of the tympanic nerve?
Fibers carried through tympanic canaliculus to tympanic cavity
What is the tympanic plexus and where is it?
Fibers from tympanic nerve and postganglionic sympathetic fibers from superior cervical ganglion
located in tympanic cavity
What kind of info does the tympanic plexus carry
somatosensory from tympanic cavity, pharyngotympanic tube, and mastoid air cells
What happens to the pregang parasym fibers originally carried in tympanic nerve
Pass through tympanic plexus and reform as lesser petrosal nerve
Where does lesser petrosal nerve go?
travels through lesser petrosal canal to otic ganglion
where are postganglionic parasym fibers from otic ganglion carried and in what
Carried in branches of CN V3
to parotid, buccal, and inferior labial glands
Where does the carotid branch enter the nerve?
ascends from below and enters at inferior ganglion
what kind of info does carotid branch carry
afferent info from chemoreceptors in carotid body and baroreceptors in carotid sinus
similar to info carried in vagus
What info does pharyngeal branch carry
sensory from mucosa of pharynx
what forms pharyngeal plexus and where
pharyngeal branches and some vagal branches
near middle pharyngeal plexus
What does muscular branch supply
stylopharyngeous
Tonsilar branch supplies what
sensory info from palatine and oral mucosa
Lingual branch supplies what
genera sensory and taste info from tongue, posterior to sulcus terminalis
