IX Glossopharyngeal Flashcards
Origins of Glossopharyngeal nerve
- nucleus of solitary tract (medulla)
- nucleus ambiguus (medulla)
- inferior salivatory nucleus (pons)
- nucleus of spinal tract of trigeminal
Glossopharyngeal
Function of nucleus of solitary tract fibers
Taste & autonomic
Glossopharyngeal
Function of nucleus ambiguus fibers
Motor
Glossopharyngeal
Function of inferior salivatory nucleus fibers
Parasympathetic
Where does Glossopharyngeal nerve exit the brain?
Post-olivary sulcus, medulla
Motor functions of Glossopharyngeal nerve
Stylopharyngeus muscle
Sensory functions of Glossopharyngeal nerve
- taste from posterior 1/3 tongue
- middle ear, tympanic cavity, eustachian tubes, tonsils, naso-oro-pharynx, uvula, soft palate, posterior 1/3 tongue
Parasympathetic function of Glossopharyngeal nerve
- parotid gland via the otic ganglion
- afferent parasympathetic fibers from carotid sinus/body
Preganglionic parasympathetic fibers from the Glossopharyngeal nerve form the ____
Tympanic nerve
Tympanic nerve enters the tympanic plexus and is joined by…
Sympathetic fibers from carotid plexus (superior cervical ganglion)
glossopharyngeal
sympathetic (carotid plexus) & parasympathetic (tympanic n) fibers form the ____ which synapses in the ____
lesser petrosal nerve
otic ganglion
glossopharyngeal
postganglionic fibers from the otic ganglion enter the ____ to supply the ____
auriculotemporal nerve (V3)
parotid salivary gland
examination of glossopharyngeal nerve
taste & general sensation of posterior 1/3 tongue & oropharynx, sensory part of gag reflex
lesion of glossopharyngeal nerve
- aberrations in BP
- sometimes pain (glossopharyngeal neuralgia) or loss of sensation in naso-oro-pharyngeal area
- absent gag reflex
