Vagus Nerve

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Author:
Anonymous
ID:
105312
Filename:
Vagus Nerve
Updated:
2011-09-29 21:25:40
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Vagus Nerve CN
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Description:
Med School - Vagus Nerve
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  1. How does the vagus nerve exit the skull?
    Jugular Foramen
  2. What is the jugular ganglion, where is it located?
    • Contains: GSA
    • Located: Prior to exit through the jugular foramen
  3. What is the nodose ganglion and where is it located?
    • Contains: GVA, Taste
    • Located: After the exit through the jugular foramen
  4. What 2 GSA nerves are given off after leaving passing through the jugular foramen?
    • Recurrent meningeal branch
    • Auricular Nerve
  5. What is the course of the recurrent meningeal branch and what is its function?
    • Course: Back up through jugular foramen
    • Function: GSA to dura inferior to tentorium
  6. What is the function of the auricular nerve and what goes with it?
    • Function: GSA to external auditory meatus, external surface of the tympanic membrane and adjacent ear structures
    • Followed by: IX auditory branch
  7. What are the components of the pharyngeal branch and their functions?
    • Taste: To epiglottis
    • Branchimotor: To pharyngeal muscles derived from the 4th pharyngeal arch
    • GVA: To pharyngeal plexus
  8. Where does the carotid sinus branch of X come from, what does it travel with and what does it innervate?
    • From: Either pharyngeal branches or superior laryngeal nerve
    • Travels with: Carotid sinus branch of IX
    • Innervation: Carotid body C-R
  9. What 2 branches are found within the superior laryngeal and what do they do?
    • Internal Laryngeal (GVA): Travels through thyrohyoid membrane to innervate laryngeal mucosa superior to true vocal cords
    • External Laryngeal (Branchiomotor): Cricothyroid muscle
  10. Where does the GVA component of the recurrent laryngeal branch go to and what are they also called?
    • Innervation: Laryngeal mucosa INFERIOR to true vocal cords
    • Also called: Inferior laryngeal nerves
  11. What does the branchiomotor component of the recurrent laryngeal branch go to?
    • All muscles of larynx (EXCEPT cricothryoid)
    • Cricopharyngeus
    • Striated muscle of upper esophagus
  12. Where does the vagus nerve terminate its GSA fibers??
    Abdominal Wall: Mucous membrane, smooth muscle and glands of abdominal viscera
  13. Where does the vagus terminate its GVE/Parasympathetic fibers?
    • Enterior ganglia
    • Cardiac/Pulmonary ganglion - to thoracic viscera
  14. How do you check the integrity of the glossopharyngeal nerve?
    • By checking the gag reflex
    • Stroke wall of pharynx over palatine tonsils
  15. What will damage to the pharyngeal branches of vagus nerve cause?
    Difficulty in swollowing bc difficult to elevate soft palate adequately
  16. What will damage to the recurrent laryngeal nerve cause?
    Hoarseness/loss of voice
  17. What will cause the abductors of the vocal cord to lie in an adducted position?
    Compression of the recurrent laryngeal nerve
  18. What occurs if the recurrent laryngeal nerves are completely transected?
    • Vocal cords will be immobile and opposite fold will move across midline
    • Voice will be sound normal but tire easily
  19. In a thyroidectomy, what must be done first?
    Finding the recurrent laryngeal nerve

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