CN X Part 2 Flashcards
What kind of fibers are carried by the branches to the carotid?
viscerosensory fibers
Where do the branches to the carotid carry info to and from?
from chemoreceptors in the carotid body to the inferior part of the nucleus for the solitary tract
Where is the superior laryngeal nerve given off?
just inferior to the inferior ganglion
What does the superior laryngeal nerve divide into?
internal and external laryngeal nerves
What kind of info is carried by the external laryngeal nerve and where?
motor info to the cricothyroid
What kind of info is carried by the internal laryngeal nerve and where?
sensory info from the laryngeal mucosa as far inferior as the vocal cords
Where is somatosensory info carried by the Vagus?
spinal nucleus of trigeminal
Where is viscerosensory info carried by the Vagus?
solitary nucleus
What nerve carries sensory info from below the vocal folds?
recurrent laryngeal
What muscle of the larynx does the recurrent laryngeal NOT supply?
cricothyroid (external laryngeal got this one)
What muscles ARE supplied by the recurrent laryngeal nerve and what are their actions?
thyroarytenoid (shortens vocal cords by pulling arytenoid cartilages forward) posterior cricoarytenoid (opens rima glottis) lateral cricoarytenoid (closes rima glottis) arytehnoid muscles (closes the rima glottis)
Other than motor info, what else is carried by the recurrent laryngeal nerve?
sensory info from the larynx inferior to the vocal cords
T/F: the recurrent laryngeal nerve follow the same path on both side.
False
which side of the recurrent laryngeal nerve is longer?
left side
Where does the recurrent laryngeal nerve come off of the vagus on the left side?
after the vagus passes in front of the aortic arch
After the recurrent laryngeal nerve comes off of the vagus nerve on the left side, where does it go?
passes under the aortic arch and ascends
What does the recurrent laryngeal nerve eventually become and what does it supply?
inferior laryngeal nerve which supplies the laryngeal musculature
What major vessel does the recurrent laryngeal nerve pass posterior to on the left?
aorta, specifically the aortic arch
What major vessel on the right does the recurrent laryngeal nerve pass posteriorly under before ascending similarly to the left?
subclavian artery
Does the vagus descend anterior or posterior to the aorta and subclavian arteries?
anterior
How many parasym contributers does the vagus supply to the cardiac plexus? sympathetic contributors/
2 parasym, 3 sym
What kind of info is carried by the superior and inferior cervical cardiac branches to the cardiac plexus?
parasym
What do the superior branches of the vagus nerve travel with to get to the cardiac plexus?
great vessels
What gives off the inferior cervical cardiac branches and where do they travel?
recurrent laryngeal nerve; cardiac plexus
One branch of the cervical cardiac branches carries viscerosensory info concerning the wall of the aorta. When is this nerve stimulated?
When aortic pressure is too high
What is the cardiac paradox?
sympathetic supply dilates coronary arteries and parasympathetic constricts coronary arteries; Baroreceptors (parasym) cause vasodilation except in coronary arteries.
Once the vagus nerve enters the thorax, what structure does it pass behind?
the root of the ipsilateral lung
What plexus does the vagus nerve contribute to once it enters the thorax?
pulmonary plexus
After contributing to the pulmonary plexus, what plexus does the vagus travel to and how does it get there?
the right vagus passes posteriorly and the left vagus passes anteriorly over the esophagus contributing to the esophageal plexus
Which u\pulmonary plexus is larger?
posterior
T/F: both pulmonary plexuses carry sympathetic info
true
Where does the anterior pulmonary plexus receive sympathetic info from?
cervical sym ganglion
Where does the posterior pulmonary plexus receive sympathetic info from?
2nd-5th or 6th thoracic ganglia
Where does the right vagus nerve enter the abdominal cavity?
through the esophageal opening
What does the right vagus nerve become once it enters the abdominal cavity?
posterior vagal trunk
Where does the right vagus nerve terminate?
large celiac branch
T/F: the right vagus sends branches to the anterior stomach after it becomes the posterior vagal trunk.
false; should say posterior stomach
Where does the large celiac branch of the vagus nerve send branches? what organs are supplied by these?
celiac, superior mesenteric and renal plexuses; to the duodenum, liver, kidneys, small intestine and proximal 2/3 of the large intestine
What anatomical structure correlates to the celiac branch of the vagus nerve (similarly to the arterial supply)
splenic/left colic flexure
What does the left vagus nerve become once it enters the abdominal cavity?
anterior vagal trunk
How does the left vagus nerve enter the abdominal cavity?
through the esophageal opening
What organs are supplied by the anterior vagal trunk/left vagus nerve?
stomach, liver, pancreas and superior part of the duodenum
What kind of info is carried by branches of the vagus nerve that are distributed via plexuses?
sympathetic and preganglionic parasym
What would a bilateral dissection of the vagus nerve lead to?
death
What would occur following a lesion of CN X within the cranial vault or close to the skull?
widespread problems: palatal, pharyngeal and laryngeal
Damage to the recurrent laryngeal nerve would lead to what?
hoarseness or decreased volume of speech
