Facial Nerve

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Facial Nerve
2011-09-27 23:50:07
Facial Nerve CN VII

Med School - Facial Nerve Review
Show Answers:

  1. Where does the facial nerve exit the head?
    Internal acoustic/auditory meatus
  2. Upon exiting through the internal auditory meatus, what does the facial nerve consist of?
    • Nervous intermedius: Sensory, parasympathetic
    • Motor Root: Branchiomotor
  3. What pharyngeal arch muscle derivates are stimulated by the branchiomotor component of CN VII?
    Second pharyngeal arch
  4. What cell bodies are found in the genticulate ganglion?
    • GSA
    • GVA
    • Taste
  5. What does the greater (superficial) petrosal nerve exit through and what components does it contain?
    • Exit: Facial canal hiatus
    • Components: GVA, GVE, Taste
  6. Upon coursing over the foramen lacerum, where does the greater petrosal nerve go to, what is it now called and who is it joined by?
    • Goes to: Pterygoid Canal
    • Joined by: Deep petrosal Nerve
    • Now called: Vidian nerve, or nerve of the pterygoid canal
  7. What is contain in the nerve of the pterygoid canal/Vidian nerve?
    • GVA
    • GVE
    • Taste
    • Sympathetic Component
  8. What type of innervation is brought in throught the joining of the deep petrosal nerve?
    • Post-ganglionic sympathetics
    • Comes from the interal carotid artery
  9. Where is the pterygopalatine ganglion found, what is it attached to, and what synapses within it?
    • Found: Pterygopalatine fossa
    • Attached to: V2 - Maxillary nerve
    • Synapses: GVE (parasympathetic) components of the nerve of the pterygoid canal
  10. After synapsing in the pterygopalatine ganglion, where do the parasympathetic/GVE fibers go and how do they get there?
    • Lacrimal, nasal, palatine glands
    • Via V1 and V2
  11. Where do the sympathetic and GSA/Taste components go to after leaving the pterygopalatine ganglion and how do they get there?
    • Sympathetic: Nasal, Lacrimal gland via V
    • GSA/Taste: Nasopharynx via V2 (nasopalatine and descending palatine nerves)
  12. After passing the middle ear cavity, what branch is given off of the facial nerve and what components does it have?
    • Branch: Stapedius muscle nerve
    • Components: Branchiomotor
  13. Prior to exiting through the stylomastoid foramen, what nerve is given off and what are its components?
    • Nerve: Chorada Tympani
    • Components: Taste, GVE (PS)
  14. How does the Chorda Tympani nerve enter the infratemporal fossa?
    Through the petrotypanic fissure
  15. What nerve does the chorda typani join?
    The lingual nerve of V3
  16. What is the submandibular ganglion physically associated with, and what cell bodies are found within it?
    • Physically: Lingual Nerve, V3
    • Cell Bodies: GVE (PS) of Chorda Tympani nerve
  17. Where do the PS and taste components passing through the submandibular gland go to and how do they get there?
    • Get there: Riding the lingual nerve of V3
    • GVE/Parasympathetic: Secreto-motor to submandibular and sublingual glands
    • Taste: Taste to the anterior 2/3 of the tongue
  18. What does the lingual nerve as a branch of V3 do without the facial nerve components?
    Provide general sensation (pain, T, touch and P) to the anterior 2/3 of the tongue
  19. Where does the facial nerve emergy from at the end of its course through the facial canal?
    Stylomastoid foramen
  20. What does the posterior auricular nerve innervate?
    • GSA: External auditory meatus, external tympanic membrane, posterior skin of the external ear
    • Branchiomotor: Occipitalis muscle and vestigial auricular muscles
  21. As the facial nerve goes through the parotid gland, what branches are formed?
    • Temporal
    • Zygomatic
    • Buccal
    • Marginal mandibular
    • Cervical
  22. What muscles are supplied by the T-Z-B-M-C branches of the facial nerve?
    • Platysma
    • Orbicularis oris
    • Buccinator
    • Orbicularis Oculi
  23. What is the action and innervation of occipitalis?
    • Action: Raise eyebrows
    • Innervation: Posterior auricular n
  24. What is the action and innervation of orbicularis oris?
    • Action: Close lips
    • Innervation: Terminal VII branches
  25. What is the action and innervation of buccinator?
    • Action: Press cheek against molar teeth, chewing
    • Innervation: Terminal VII branches
  26. What is the action and innervation of orbicularis oculi?
    • Action: Close eyelid
    • Innervation: Terminal VII branches
  27. What is Bell's Palsy?
    • Inflammation of the facial nerve in the facial canal
    • Causes paralysis of facial muscles
  28. A lesion of the lingual nerve where it originates causes what?
    Loss of general sensation to anterior 2/3 of tongue
  29. Lesion of lingual nerve after being joined by the chorda tympani causes what?
    • Loss of general sensation (lingual nerve)
    • Loss of anterior 2/3 taste (chorda tympani taste)
    • Loss of secretion of submandibular and sublingual glands (GVE of chorda tympani)
  30. How do you test the facial nerve?
    • Ask patient to wrinke forehead, frown, smile and raise eyebrows
    • Observe asymmetry
  31. What is the function of the stapedius and tensor tympani?
    • Protective against loud noises
    • Limit excursion of the ear ossicles when a loud noise causes vibration of tympanic membrane