unit 4: CN X, vagus Flashcards
as a mixed cranial nerve, the vagus carries ___, ___, & ___ info as well as some ____ info from the epiglottal region
motor
parasympathetic
sensory
taste
the vagus is the most important ____ nerve
parasympathetic
MOTOR nucleus of origin of the vagus
-is somatotopically organized, w/ info from both hemispheres
nucleus ambiguus
preganglionic parasympathetic nucleus of origin, which receives info indirectly from the hypothalamus & carotid sinus
posterior (dorsal) nucleus of vagus
there are two nuclei of termination for the vagus:
- somatic sensory info terminates in the ______
- taste & viscerosensory info terminate in the ____
- spinal nucleus of CN V
- solitary nucleus
two peripheral ganglion that are associated with the vagus nerve
-not to be confused with those of the same name of the glossopharyngeal nerve
superior ganglion (*of the vagus*) inferior ganglion (*of the vagus*)
somatic sensory info is carried in neurons whose cell bodies are located in the
superior ganglion
somatic sensory info is carried to from the
- dura
- auricle
- external auditory canal
- lateral tympanic membrane
- oropharynx & laryngopharynx mucusa
- -to terminate in this nucleus:
spinal nucleus of the trigeminal
taste from the epiglottis terminates in the SUPerior part of the ____ ____, by neurons with CB in the _____ ____
solitary nucleus
inferior ganglion
visceral sensory info terminates in the INFerior part of the ____ ____, by neurons w CB in the ___ ___
solitary nucleus
inferior ganglion
the vagus carries ___ ___ info from the larynx, laryngopharynx, viscera in the thoracic & abdominal cavities, ___ receptors in the aortic arch, & ____receptors in the para-aortic body
visceral sensory
pressure
chemo
the apparent origin of the vagus nerve, where it emerges as a series of rootlets
lateral aspect of medulla oblongata
the vagus trunk exits the skull through the __ __, which is compartmentalized by a fibrous septum
jugular foramen
a meningeal branch is given off before the vagus exits the jugular foramen and it supplies the:
infratentorial dura of the posterior cranial fossa
the vagus & accessory nerves travel ___ to the fibrous septum of the jugular foramen, while the glossopharyngeal travels ____
-the vagus and accessory also share a meningeal sheath
anterior
posterior
the ____ ganglion is located IN the jugular foramen, while the larger ___ ganglion is located INFERIOR to the jugular foramen
superior
inferior
the auricular branch is given off the vagus at the superior ganglion, and travels through the ____ ____ & ___ ____ to reach the external auditory meatus
mastoid canaliculus
tympanomastoid fissure
the auricular branch carries sensory info from these two places
meatus
small portion of the auricle
after exiting the jugular foramen, the vagus travels inferiorly w/i the carotid sheath bt the __ __ artery & ___ ____ vein
internal carotid
internal jugular
inferior to the carotid bifurcation, the vagus will travel between the __ __ vein and ___ __ artery
internal jugular
common carotid
branches of the vagus that are given off in the neck (5)
pharyngeal branches to carotid superior laryngeal recurrent laryngeal superior & inferior cervical cardiac branch
the ___ branch of the vagus comes of at the inferior ganglion and combines w glossopharyngeal fibers and sympathetic fibers from the sympathetic trunk to form the ___ plexus
pharyngeal
pharyngeal
pharyngeal (vagal) motor fibers will supply the (2):
pharyngeal constrictor muscles
levator veli palatine muscle (of soft palate)
vagal branches that relay viscerosensory info from chemoreceptors in the carotid body TO the inferior part of the solitary nucleus
-given off in inferior ganglion
branches to carotid artery
vagal nerve that is given off inferior to inferior ganglion and splits into an internal and external branch
superior laryngeal nerve
the EXTERNAL laryngeal nerve provides MOTOR supply to the
cricothyroid muscle
-tighten/elongates vocal folds
the INTERNAL laryngeal nerve carries SENSORY info from
laryngeal mucosa (up to the vocal folds)
the recurrent laryngeal nerve supplies MOTOR fibers to
all muscles of larynx EXCEPT cricothyroid
- thyroarytenoid
- posterior cricoarytenoid
- lateral cricoarytenoid
- arytenid muscles
the recurrent laryngeal carries SENSORY info from the
larynx, inferior to vocal folds
-on the LEFT side:
the recurrent laryngeal comes off after the vagus passes _____ the aortic arch, it then passes ____ the aortic arch and ascends to become the ___ ____ nerve
in front of
under
inferior laryngeal
the inferior laryngeal nerve supplies
laryngeal musculature
-on the RIGHT side:
the recurrent laryngeal nerve passes _____ under the _____ artery before ascending similarly to the left
posteriorly
subclavian
the superior & inferior cervical cardiac branches carry PARA info to the ___ ___
cardiac plexus
the ____ cardiac branches leave the vagus and travel with the great vessels (IVC, aorta) to the cardiac plexus
superior
the ___ cardiac branches are given off by the recurrent laryngeal and travel to cardiac plexus
inferior
one cervical cardiac branch will carry viscerosensory info of pressure on the wall of the aorta, and will be stimulated when ___ ___ becomes to high
aortic pressure
after the vagus nerves enter the thorax, they pass posterior to the root of the ipsilateral lung and contrib to the ____ plexus
pulmonary
at the pulmonary plexus, the RIGHT vagus passes ____ and the LEFT vagus passes ____ over the esophagus, to contrib to the esophageal plexus
posteriorly
anteriorly
the ANTERIOR pulmonary plexus receives fibers from:
CERVICAL sympathetic ganglia
the POSTERIOR pulmonary plexus receives fibers from
THORACIC ganglia
the RIGHT vagus enters the abdom cavity thru the esophageal opening and becomes the ____ vagal trunk, which sends branches to the posterior stomach
posterior
the POSTERIOR vagal trunk terminates in a celiac branch that sends branches to the (5):
duodenum liver kidneys SI proximal 2/3 of LI
the posterior vagal trunk reaches its organs via these three plexuses, which carry preganglionic PARA & sensory info
celiac
superior mesenteric
renal
the LEFT vagus becomes the ___ vagal trunk after endering the abdom cavity thru the esophageal opening
anterior
the ANTERIOR vagal trunk sends branches to the (5):
stomach liver pancreas superior duodenum spleen
