Flashcards in Exam 2 CN X Deck (56)
Is vagus a motor or sensory nerve?
It is mixed!
What type of fibers does the vagus nerve carry
Motor, parasympathetic, and sensory information
Where does the vagus carry some taste information from
The epiglottal region
What 2 things make the vagus nerve so special
- it is the longest cranial nerve
- it is the most important parasympathetic nerve
Where are the motor fibers cell bodies that are carried in the vagus
In the nucleus ambiguus
Where does the nucleus ambiguus receive information from
Both cerebral hemispheres
Where do preganglionic parasympathetic fibers arise from in the vagus
The posterior (dorsal) nucleus of the vagus
Where do the preganglionic parasympathetic fibers receive info from?
Indirectly from hypothalamus and carotid sinus
What terminates in the spinal nucleus of CN V when talking about the vagus
What information terminates in the nucleus of the solitary tract
Taste and viscerosensory
What two peripheral ganglia are associated with the vagus nerve and what are their alternate names?
Superior (jugular) and inferior (nodose) ganglions . Not the same as in CN IX
Where are the cell bodies located for neurons carrying somatic sensory information
Superior ganglion or jugular ganglion
How is taste from the epiglottis carried in vagus
Carried to the superior portion of nucleus of the solitary tract by neurons located in the inferior ganglion
How is visceral sensory information carried in the vagus
It is carried to the inferior part of the nucleus for the solitary tract by neurons located in the inferior ganglion
Where does the vagus nerve carry visceral sensory information from?
Larynx, laryngopharynx, viscera in thoracic/abdominal cavities, pressure receptors in aortic arch, chemoreceptors in para-aortic body
Where does the vagus nerve emerge from as a series of rootlets
The lateral aspect of medulla oblongata (A.O.)
What branch of vagus supplies the infratentorial dura (posterior cranial fossa)?
How does the vagus exit the skull?
Through the jugular foramen
How is the jugular foramen compartmentalized
By a fibrous septum. C.N. X and XI travel anterior to the septum. C.N. IX travels posterior to the septum
What two CN share a meningeal sheath (arachnoid and dura)
CN X and XI
Which ganglion is located in the jugular foramen
The superior ganglion
Where is the inferior ganglion located
Just inferior to jugular foramen
What branch carries sensory information from the meatus and small portion of the auricle
The auricular branch
What is the course of the auricular branch
Through mastoid canaliculus and tympanomastoid fissure to reach external auditory meatus
After exiting the jugular foramen and moving inferiorly what does the vagus nerve travel within
Where is the carotid sheath located
Between internal carotid artery and internal jugular vein
Where does the vagus nerve travel after the carotid sheath
Between the internal jugular vein and common carotid artery inferior to carotid bifurcation
Where does the pharyngeal branch leave the vagus nerve
At the level of the inferior ganglion
What fibers does the pharyngeal branch combine with after leaving inferior ganglion
Combine with fibers from glossopharyngeal nerve and sympathetic fibers from sympathetic trunk