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How does the vagus nerve exit the skull?
What is the jugular ganglion, where is it located?
- Contains: GSA
- Located: Prior to exit through the jugular foramen
What is the nodose ganglion and where is it located?
- Contains: GVA, Taste
- Located: After the exit through the jugular foramen
What 2 GSA nerves are given off after leaving passing through the jugular foramen?
- Recurrent meningeal branch
- Auricular Nerve
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
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
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
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
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
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
What does the branchiomotor component of the recurrent laryngeal branch go to?
- All muscles of larynx (EXCEPT cricothryoid)
- Striated muscle of upper esophagus
Where does the vagus nerve terminate its GSA fibers??
Abdominal Wall: Mucous membrane, smooth muscle and glands of abdominal viscera
Where does the vagus terminate its GVE/Parasympathetic fibers?
- Enterior ganglia
- Cardiac/Pulmonary ganglion - to thoracic viscera
How do you check the integrity of the glossopharyngeal nerve?
- By checking the gag reflex
- Stroke wall of pharynx over palatine tonsils
What will damage to the pharyngeal branches of vagus nerve cause?
Difficulty in swollowing bc difficult to elevate soft palate adequately
What will damage to the recurrent laryngeal nerve cause?
Hoarseness/loss of voice
What will cause the abductors of the vocal cord to lie in an adducted position?
Compression of the recurrent laryngeal nerve
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
In a thyroidectomy, what must be done first?
Finding the recurrent laryngeal nerve