Exam 2 CN IX Flashcards
What type of fibers does the glossopharyngeal nerve carry?
Motor, sensory, autonomic; therefore it is mixed!
Where does the glossopharyngeal carry motor information to
The stylopharyngeus
Where does the glossopharyngeal carry sensory information from
From the pharynx
Where does the glossopharyngeal carry taste information from
The posterior tongue
Where does the glossopharyngeal carry parasympathetic information to
Leading ultimately to the parotid and other glands
Where do the cell bodies for motor fibers carried in the glossopharyngeal arise from
They are located in the superior part of the nucleus ambiguus
Where do preganglionic parasympathetic fibers arise from in the glossopharyngeal nerve
The inferior salivary nucleus
Where are afferent sensory fibers terminated with the glossopharyngeal
In the solitary nucleus
What are the two ganglia associated with the glossopharyngeal
Superior and inferior ganglia
Which peripheral ganglion is smaller and usually thought as a separate part
The superior ganglion
General sensory information carried in glossopharyngeal is from where
The nasopharynx, oropharynx, and portion of the tongue posterior to the sulcus terminalis, uvula, and palatine tonsils
General sensation from what cavity is also carried in a branch of the glossopharyngeal
Tympanic cavity
Where are the cell bodies located for general sensory info of the glossopharyngeal
The inferior ganglion where information is then conveyed to the CNS and fibers synapse in the spinal nucleus of trigeminal nerve
Taste information from the tongue posterior to the sulcus terminalis is carried by neurons from where?
The inferior ganglion
Where is taste information carried from in the glossopharyngeal
Tongue posterior to the sulcus terminalis
Axons carrying taste information have cells that synapse where
Superior portion of the solitary nucleus
Cells carrying visceral afferent information in the glossopharyngeal from where
Carotid sinus and carotid body
Incoming visceral afferent information from the inferior ganglion synapse where?
Lower part of solitary nucleus
What does the nucleus ambiguus contribute to three cranial nerves and what are those cranial nerves
Lower motor neurons to CN IX, X, XI
Axons from the lower motor neurons from nucleus ambiguus that are carried in glossopharyngeal will innervate what muscle
Stylopharyngeus
What gives rise to preganglionic parasympathetic axons carried in the glossopharyngeal
The inferior salivary nucleus
Where do preganglionic parasympathetic fibers in the glossopharyngeal nerve synaps
The otic ganglion
Postganglionic fibers after synapsing in the otic ganglion supply what?
Parotid glands, buccal glands, and inferior labial glands
What is the A.O. Of the glossopharyngeal nerve
Lateral aspect of the superior aspect of the MO
Where does the glossopharyngeal exit the skull
Via the jugular foramen
Where is the superior ganglion for the glossopharyngeal nerve located
Inside the cranium
Where is the inferior ganglion for the glossopharyngeal nerve located
Beyond the jugular foramen outside the cranium
What is another name for the inferior ganglion of the glossopharyngeal nerve
The petrosal ganglion
Where does the tympanic nerve arise from?
The inferior ganglion
What does the tympanic branch carry
Preganglionic parasympathetic fibers and sensory
What is the course of the tympanic branch of the glossopharyngeal nerve
Through the tympanic canaliculus into the tympanic cavity, in the cavity this is where it receives postganglionic sympathetic fibers
Where does the tympanic branch of glossopharyngeal nerve recieve postganglionic sympathetic fibers from and what will it then form
Superior cervical ganglion forming the tympanic plexus
What does the tympanic plexus carry
Somatosensory info from tympanic cavity, pharyngotympanic tube, and mastoid air cells
After pregang para fiber pass through the tympanic plexus what do they reform as
The lesser petrosal nerve that travels through the lesser petrosal canal to otic ganglion
Post gang para fibers from otic ganglion are carried in what to parotid, buccal, and inferior labial glands
CN V3
Where does the carotid branch enter and what is it carrying
The inferior ganglion carrying afferent info from chemoreceptors in carotid body and baroreceptors in carotid sinus
What info being carried in the glossopharyngeal nerve is similar to the vagus
The carotid branch from inferior ganglion carrying afferent info from chemoreceptors in carotid body and baroreceptors in carotid sinus
Pharyngeal branches convey sensory information from the mucosa of what?
Mucosa of the pharynx
Pharyngeal branches will combine with vagal branches to form what?
Pharyngeal plexus near middle pharyngeal plexus
The muscular branch leaves glossopharyngeal nerve to supply what
Stylopharyngeus
The remaining branches of glossopharygeal nerve reach what
Oral cavity
The tonsillar branches convey sensory info from where
Palatine tonsils and oral mucosa
Lingual branches carry what from where
General sensory and taste info from tongue posterior to sulcus terminalis
