The Vagus Nerve Quiz - neuroanatomy - pathway
2016-05-07 13:18:07 UTC
This is cranial nerve number...
This nerve has
different roles, and therefore has
It has 2 efferent nuclei -
nucleus ambigus and dorsal vagal nucleus
. Their cell bodies are actually in the nuclei. Respectively these supply the fibres of
branchiomotor muscles of larynx/pharynx/soft palate + DVN gives all of the preganglionic parasympathetic secretomotor fibres from the larynx to every organ en route to the gut.
It has 2 afferent nuclei, named
Nucleus of the sollitary tract (tractus solitarius) + spinal part of the trigeminal nucelus
. Their cell bodies are not in the nuclei, they are just sending axons back there. Respectively these function to supply
tractus is T for Taste (posterior 1/3 tongue) and spinal trigeminal nucleus is touch/temperature/pain sensation (from ear canal and external tympanic membrane)
The nerve arises from the brainstem between nerves 9 and 11, more specifically from the part known as the ...
, super specifically, arising from the part of that known as the ...
When it comes off, it does not arise as a single nerve root, in actual fact, it arises as how many individual nerve rootlets...
8 to 10
These immediately come together, and join. The nerve travels laterally away from the medulla through the
The nerve then exits the brain stem through the
This has a small fibrous ridge that dividies it into two parts, an anteriomedial part termed the pars nervosa, and the posteriolateral part termed the
. The vagus nerve travels through which of the two?
In the jugular foreamen, the nerve has its first ganglion, the
superior vagal ganglion also called the jugular ganglion
. This ganglion has the cell bodies of 2 somatosensory nerves that are given off here. They are the
meningeal branch of the vagus nerve and the tympanic branch of the facial nerve
As it exits the jugular foreamen, the nerve has a second ganglion, much larger than the first - because it needs to contain more Cell bodies - which is red in colour. Its termed the
inferior vagal ganglion also called the nodose ganglion
. Its much larger than the first ganglion because its function is
contains ALL the cell bodies for the visceral afferent supply for the heart, larynx, lungs and alimentary tract from the pharynx to the transverse colon
After this ganglion the nerve continues inferiorly in the neck within the
We really want your help to make our site great for medical students. How can we improve it?