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PNS Exam 2 - 1 PNS Exam 2 Study Guide Glossopharyngeal...

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1 PNS Exam 2 Study Guide Glossopharyngeal Nerve – CN IX: mixed nerve generally supplies structures related to the back of the tongue and throat somatic sensory innervation    mucous membranes of pharynx, fauces, palatine tonsil, posterior 1/3 of tongue, and middle ear somatic motor innervation    stylopharyngeus muscle visceromotor innervation    parotid and mucous glands of posterior tongue and fauces vaso-afferent innervation    blood pressure receptor (baroreceptor) cells of carotid sinus and chemoreceptor cells of carotid body special visceral afferent innervation    taste sensation from taste buds of posterior 1/3 of tongue taste buds in papillae simplicae, fungiformes, and vallate (circumvallate) apparent origin    3-4 rootlets emerging from the side of the medulla oblongata in the sulcus between the olive and restiform body, caudal to the  acoustic nerve fibers pass laterally and exit the skull thru the  jugular foramen  with CN X & XI jugular fossa   2 sensory ganglia = pseudounipolar cells jugular ganglion  – smaller & superior ganglia (may be absent)   contains gustatory neurons petrous ganglion  – larger & inferior ganglia (principle ganglion)  central processes from both ganglia enter the MO and end in  2 nuclei of termination  (synapse with secondary sensory neurons) nucleus of the spinal trigeminal tract    general sensation especially nociception nucleus of the tractus solitarius    visceral afferent function, gustation, carotid body & sinus 2 nuclei of origin in the MO nucleus ambiguus    major somatic motor nucleus greatly related to CN X & XI (XI is for stylopharyngeus muscle only) nucleus salivatorius inferioris    visceral secretomotor for parotid gland & smaller mucous glands communications: sympathetic – between the superior cervical ganglion & petrous ganglion with the vagus between the petrous ganglion of XI and jugular ganglion with the auricular nerve with the facial nerve after it exits the stylomastoid foramen branches of distribution: Tympanic Nerve (Jacobsen) sensory and viscero-motor fibers from the petrous ganglion passes into middle ear thru floor & communicates with the caroticotympanic nerve of the sympathetic nervous system to form the  tympanic plexus sensory fibers from petrous ganglion supply the mucous membrane of the eardrum visceromotor fibers are gathered into the lesser petrosal nerve from the tympanic plexus carry preganglionic visceral efferent impulses from the nucleus salivatorius inferioris
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