Exam 2: Facial Nerve

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Exam 2: Facial Nerve
2012-06-26 17:50:21
anatomy facial nerve

review of 6/26 lecture on the facial nerve for exam 2
Show Answers:

  1. Which cranial nerve is the facial nerve?
    CN VII
  2. Which nerve has more pathology than any other cranial nerve?
    facial n. (CN VII)
  3. What are the components of the facial nerve?
    • special visceral efferent (SVE)
    • general visceral efferent (GVE)
    • special visceral afferent (SVA)
    • general somatic afferent (GSA)   
  4. What do SVE motor fibers innervate?
    muscles of facial expression
  5. Where are the nerve cell bodies of the SVE?
    in motor nucleus of facial nerve
  6. What do GVE motor fibers provide?
    parasympathetic innervation to lacrimal gland, mucosa of palate and nasal cvities, and submandibular and sublingual salivary glands
  7. Where are the preganglionic nerve cell bodies of the GVE?
    in superior salivatory nucleus
  8. Where do the preganglionic nerve cell bodies of the GVE synapse with postganglionic fibers?
    two different parasympathetic ganglia
  9. What are the two parasympathetic ganglia where the GVE neurons synapse?
    • pterygopalatine ganglion
    • submandibular ganglion 
  10. What do postganglionic fibers from the pterygopalatine ganglion supply?
    • lacrimal gland
    • mucous glands in nasal cavities
    • palate  
  11. What do postganglionic fibers from the submandibular ganglion supply?
    sublingual and submndibular salivary glands
  12. What are the SVA fibers of the facial nerve for?
    taste (from anterior 2/3 of tongue
  13. Where are the SVA fibers?
    present in chorda tympani branch of facial nerve
  14. What is a geniculate ganglion?
    nerve cell bodies for sensory neurons of the SVA (like dorsal root ganglion of spinal cord)
  15. What does the GSA innervate?
    cutaneous innervation from portion of external auditory meatus and auricle
  16. What besides GSA provide "position sense" for facial muscles?
    proprioceptive fibers
  17. Where is the motor nucleus for the facial nerve?
    in the pons
  18. What nerve does the facial nerve leave the side of thebrain stem in company with?
    vestibulocochlear nerve
  19. What cranial nerve is the vestibulocochlear nerve?
  20. How does the facial nerve exit the cranial cavity?
    by entering internal acoustic meatus
  21. After the facial nerve enters the internal acoustic meatus it turns sharply to enter what?
    facial canal
  22. The facial canal opens externally at which foramen?
    stylomastoid foramen
  23. Where is the stylomastoid foramen?
    posterior to the external ear
  24. After he facial nerve exits the skull what does it enter?
    parotid gland
  25. The greater petrosal nerve joins with the deep petrosal nerve to become what?
    the nerve of the pterygoid canal
  26. What type of neuron is the greater petrosal nerve?
    preganglionic parasympathetic
  27. What kind of neuron is the deep petrosal nerve?
    postganglionic sympathetic
  28. Where does the nerve of the pterygoid canal travel?
    anteriorly to join pterygopalatine ganglion
  29. What is at the pterygopalatine ganglion?
    nerve cell bodies of postganglionic parasympathetic neurons are located
  30. Where are the postganglionic parasympathetic fibers distributed?
    to lacrimal gland and mucous glands in nasal mucosa and palate
  31. The postganglionic sympathetic fibers pass through the pterygopalatine ganglion to innervate what?
    blood vessels of lacrimal gland, nasal mucosa and palate
  32. Where does the nerve to the stapedius muscle enter to supply it?
    eners the middle ear cavity
  33. What does the chorda tympani nerve pass through on its way to the infratemporal fossa?
    through the middle ear
  34. What nerve does the chorda tympani nerve join with at the infratemporal fossa?
    lingual nerve (CN V3)
  35. When the lingual nerve reaches the tongue what happens to the preganglionic parasympathetic fibers traveling with it?
    peel off and go to submandibular ganglion
  36. What does the submandibular ganglion contain?
    nerve cell bodies of the postganglionic parasympathetic neurons
  37. Where are the postganglionic parasympathetic fibers distributed?
    to submandibular and sublingual glands
  38. What other fibers are contained in the chorda tympani nerve?
    SVA fibers
  39. What do the SVA fibers of the chorda tympani provide?
    tast from anterior 2/3 of tongue
  40. Where does the facial nerve send a sensory branch (GSA) after exiting the stylomastoid foramen?
    to the external auditory meatus and auricle
  41. What are the terminal branches of the facial nerve?
    • temporal 
    • zygomatic
    • buccal
    • mandibular
    • cervical
  42. Wht do the terminal branches of the facial nerve supply?
    muscles of facial expression (including platysma)
  43. Where is the temporal branch of the facial nerve?
    crosses zygomatic arch to supply superficial mm.
  44. Where is the zygomatic branch of the facial nerve?
    pass over zygomatic bone to supply mm. in infraorbital area
  45. Where are the buccal branches of the facial nerve?
    cross masseer as they go to angle of mouth
  46. Where is the mandibular branch of the facial nerve?
    runs across lowerborders of msseter and external surface of mandible
  47. Where is the cervical branch of the facial nerve?
    runs downward and forward below body of mandible to supply platysma
  48. What would a lesion involving the motor nucleus of the facial nerve in the brainstem produce?
    ipsilateral paralysis of mm. of facial expression and muscle atrophy
  49. How might peripheral facial nerve paralysis result?
    frm chilling of the face, middle ear infectins, tumors and fractures
  50. What is another name for facial nerve palsy?
    Bell's palsy
  51. Weakness, rather than complete paralysis of a muscle usually results from injury to what?
    branches of facial nerve because of overapping distribution
  52. What are symptoms of Bell's palsy?
    • drooping of face
    • drooling
    • trouble blinking 
  53. Is Bell's palsy a permanent condition?
    sometimes, but it can be temporary