Glossopharyngeal Nerve

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Glossopharyngeal Nerve
2011-09-28 00:29:49
Glossopharyngeal CN IX

Medical School - Glossopharyngeal nerve CN IX
Show Answers:

  1. How does the glossopharyngeal nerve exit the skull?
    Jugular foramen
  2. What is located within the superior ganglion of IX?
    Cell bodies of GSA
  3. What is located within the inferior ganglion of IX?
    Cell bodies of GVA and taste
  4. Trace the path of the tympanic nerve until it forms the tympanic plexus?
    • Leaves inferior to inferior ganglion
    • Passes through tympanic canaliculus
    • Reaches medial wall of tympanic cavity
    • Forms tympanic plexus!
  5. Where is the tympanic canaliculus located?
    Between carotid and jugular foramen
  6. What is the tympanic plexus made of and what does it innervate?
    • Made of: GVA
    • Innervates: Mucosa of middle ear cavity, internal surface of tympanic membrane
  7. What does the remainder of the tympanic nerve turn into after leaving the tympanic plexus?
    Lesser petrosal nerve
  8. How does the lesser petrosal nerve leave the middle cranial fossa?
    Foramen ovale
  9. Where does the lesser petrosal nerve synapse and what cell bodies are found there?
    • Synapses: Otic ganglion
    • Cell bodies: GVE/Parasympathetic
  10. What do the parasympathetic postganglionic fibers do after leaving the otic ganglion?
    Ride with auricotemporal to go do secretomotor stuff to the parotid gland
  11. What other type of fibers ride with the auricotemporal nerve and how do they get there and what do they do?
    • Sympathetic postganglionic (GVE)
    • Get there: Middle meningeal branch of the maxillary artery
    • Do: Sympathetic innervation to the parotid gland
  12. What does the auricular nerve contain, where does it go and how does it get there?
    • Contain: GSA
    • Goes to: Auricle and external auditory meatus
    • Gets there: Riding auricular branch of vagus nerve
  13. What does the carotid sinus nerve do adn what type of neurons does it contain?
    • GVA branches to the common carotid artery bifurcation
    • Innervates P-R and C-R of the carotid sinus and body
  14. What muscle is innervated by the branchiomotor component of the IX?
  15. How does the IX reach the pharyngeal plexus?
    Passes between superior and middle pharyngeal constrictors
  16. What happens at the pharyngeal plexus?
    • Sensory innervation to the pharyngeal mucosa
    • Posterior 1/3 of the tongue - taste and general sensation