exam 2 glossopharyngeal nerve Flashcards
the glossopharyngeal nerve is carries what type of information?
it is a mixed nerve that carries sensory, motor, and autonomic information
the motor fibers of the glossopharyngeal nerve arise from where?
cell bodies located in the superior part of the nucleus ambiguus
the preganglionic parasympathetic fibers of the glossopharyngeal arise from where?
inferior salivatory nucleus
afferent, sensory fibers of the glossopharyngeal nerve terminate where?
solitary nucleus
what are the two peripheral ganglia associated with the glossopharyngeal nerve?
the superior ganglion
the inferior ganglion
what is the correlation between the superior and inferior ganglia?
the superior ganglion is smaller and is thought to be a separated part of the inferior ganglion
general sensory informatio is carried from the glossopharyngeal nerve from where?
Nasopharynx Oropharynx portion of tongue posterior to sulcus terminalis uvula palatine tonsils tympanic cavity (by a branch)
where are the cell bodies for the general sensory pathway located?
inferior ganglion
as information from the inferior ganglion (general sensory) is conveyed to the CNS fibers will synapse where?
they will synapse in the spinal nucleus of the trigeminal nerve (pain and temp)
what more specific sensory information is carried from the tongue (posterior to the sulcus terminalis) to theinferior ganglion?
taste information
where do the taste information axons from the inferior ganglion extend to?
superior part of the solitary nucleus
axons from the inferior ganglion to the lower part of the solitary nucleus convey what information?
they carry visceral afferent information from the carotid sinus and carotid body
Baroreceptor and Chemoreceptor
the nucleus ambiguus contributes lower motor neurons to what three cranial nerves?
9, 10, 11
axons from the lower motor neurons of the nucleus ambigiuus carried in the glossopharyngeal will innervate what muscle?
stylopharyngeus
what nucleus gives rise to the preganglionic parasympathetic axons carried in the glossopharyngeal nerve?
inferior salivatory nucleus
what fibers synapse in the otic ganglion?
preganglionic parasympathetic fibers carried in the gossopharyngeal nerve originating from the inferior salivatory nucleus.
say it all!!
what do the postganglionic fibers from the otic ganglion supply?
parotid glands
buccal glands
inferior labial glands
what is the apparent origin of the glossopharyngeal nerve?
superior aspect of the medulla oblongata
how does the glossopharyngeal nerve exit the skull?
jugular foramen
where is the superior ganglion located? and the inferior ganglion?
the superior ganglion is located is located inside the cranium and the inferior is located beyond the jugular foramen outside the cranium
where does the tympanic nerve originate from and what does it carry?
it arises from the inferior ganglion and it carries preganglionic parasympathetic fibers as well as sensory fibers.
the fibers of the tympanic nerve pass through what, to reach the tympanic cavity?
tymapanic canaliculus
what happens when the typmanic nerve enters the tymapanic cavity?
it receives postganglionic sympathetic fibers from the superior cervical ganglion and forms the tympanic plexus
what is formed when the typanic nerve receives postganglionic sympathetic fibers from the superior cervical ganglion?
the tympanic plexus is formed
what types of information does the typanic plexus carry and where from?
somatosensory information from the tympanic cavity, pharyngotympanic tube and the mastoid air cells
the preganglionic parasympathetic fibers carried by the typmanic nerve pass through the tympanic plexus and reform to become what?
the lesser petrosal nerve
where does the lesser petrosal nerve go after it is reformed from the preganglionic parasympathetic fibers of the tympanic nerve?
it passes through the lesser petrosal canal to the otic ganglion
the postganglionic parasympathetic fibers from the the otic ganglion are carried in what nerve to supply what glands?
they are carried in branches of C.N 5 V3 (mandibular) to the parotid, buccal and inferior labial glands
which visceral afferent branch ascends from below and enters the nerve at the inferior ganglion?
carotid branch
what information is supplied by the carotid branch?
afferent of the chemoreceptors in the carotid body and baroreceptors in the carotid sinus
what other nerve can carry information similar to the carotid branch?
the vagus nerve
pharyngeal branches convey what information?
sensory information from the mucosa of the pharynx
the pharyngeal branches will combine with vagal branches to form what?
the pharyngeal plexus
the muscular branch of the glossopharyngeal leaves to supply what muscle?
stylopharyngeus
elevate larynx, pharynx, and dilate pharynx
what information does the tonsilar branches carry?
sensory information from the palatine tonsils and oral mucosa
what information does the lingual branches carry?
general sensory and taste information from the tongue (posterior to the sulcus terminals)
clinical considerations?
difficulty swallowing
loss of taste
gag reflex
the general sensory information of the lingual branch terminates where?
spinal nucleus of the trigeminal
taste information of the lingual branch terminates where?
superior part of the solitary nucleus
