vagus nerve Flashcards
what is the longest nerve that carries parasympathetic information
vagus nerve
the vagus nerve carries what type of information
motor, parasympathetic and sensory information, including some taste information from the epiglottal region
the nucleus ambiguus recieves information from where and carries what type of fibers?
both cerebral hemispheres and motor fibers
preganglionic parasympathetic fibers comes from where?
posterior (dorsal) nucleus of the vagus
the vagus nerve receives information indirectly from where?
the hypothalamus and the carotid sinus
the spinal nucleus of the trigeminal nerve has what type of information synapse at it?
incoming somatic sensory
taste and viscerosensory information terminates where?
nucleus of the solitary tract
what are the two peripheral ganglia associated with the vagus nerve?
superior (jugular) and inferior (nodose) ganglia
what type of information has cell bodies located in the superior ganglion?
somatic sensory (pain) information
somatic sensory information is carried from where?
the dura (infratentorial / posterior fossa), auricle, external auditory canal, lateral tympanic membrane and mucosa of the oropharynx, laryngopharynx
taste from the epiglottis is carried to what?
superior part of the nucleus of the solitary tract by neurons in the inferior ganglion
what type of information is carried by the inferior part of the nucleus for the solitary tract?
visceral sensory
where does the visceral sensory information come from?
larynx, laryngopharynx, viscera in the thoracic and abdominal cavities, pressure receptors in the aortic arch, chemoreceptors in the para-aortic body
what is the origin of the vagus nerve?
lateral aspect of the medulla oblongata as a series of rootlets
what branch supplies infratentorial the dura of the posterior cranial fossa
meningeal branch
what compartmentalizes the jugular foramen
a fibrous septum
if the glossopharyngeal nerve travels posterior to the septum what travels anterior?
vagus and accessory nerve
what covers the vagus and the accessory nerve
meningeal sheath (arachnoid and dura)
where is the superior ganglion located
in the jugular foramen
where is the inferior ganglion located
inferior to the jugular foramen
when is the auricular branch given off
at the superior ganglion
what is the path of the auricular branch
through the mastoid canaliculus and the tympanomastoid fissure to the external auditory meatus
the auricular branch carries information from where
the meatus and a small portion of the auricle
after existing the jugular foramen where does the vagus nerve go?
it travels inferiorly within the carotid sheath, between the internal carotid artery and the internal jugular vein down to the carotid bifurcation
when is the pharyngeal branch given off?
at the inferior ganglion
what all forms the pharyngeal plexus
pharyngeal branch, glossopharyngeal nerve, sympathetic fibers from the sympathetic trunk
what will supply the motor information to the pharyngeal constrictor muscles and the levator veli palatine
vagal fibers
viscerosensory fiber of the carotid branches are given off where
inferior ganglion
viscerosensory fibers that carry information from the chemoreceptors in the carotid body to where
inferior part of the nucleus for the solitary tract
the superior laryngeal nerve is given off where
just inferior to the inferior ganglion
the superior laryngeal nerve will divide into what
the internal and external laryngeal nerve (area above the vocal fold)
the cricothyroid muscle is supplied by what
the external laryngeal nerve
sensory information from the laryngeal mucosa as far inferior as the vocal folds comes from where
internal laryngeal nerve
where does the sensory information from the laryngeal mucosa terminate
solitary nucleus
what muscle does not gets its motor fibers from the recurrent laryngeal nerve
cricothyroid
the recurrent laryngeal nerve carries sensory information from where
the larynx inferior to the vocal folds
on which side does the recurrent laryngeal nerve come off the vagus after the vagus passes in front of the aortic arch
left side
once the recurrent laryngeal nerve of the left side passes under the aortic arch and ascends what does it become and what does it supply?
becomes the inferior laryngeal nerve and supplies the laryngeal musculature
the right side of the recurrent laryngeal nerve passes where?
posteriorly to the subclavian artery
parasympathetic information from the cardiac plexus is carried by what
the superior and inferior cervical branches
the superior branch leave the vagus nerve when
at the cardiac plexus to travel with the great vessels(aorta, pulmonary vessels, superior vena cava)
the inferior cervical branch comes off what
recurrent laryngeal nerve
the superior branch will carry what type of information
viscerosensory information concerning pressure on the wall of the aorta
once the vagus nerve enters the thorax where does it go?
it will pass posteriorly to the root of the ipsilateral lung and contribute to the pulmonary plexus
the esophageal plexus has which branch contributing to it
the left vagus nerve which moves anteriorly
the right vagus nerve enters the abdominal cavity through what?
the esophageal opening and becomes the vagal trunk
the vagal trunk sends branches to where
posterior stomach and terminates in the large celiac branch
the large celiac branch sends branches where
duodenum, liver, kidneys, small intestine, and proximal 2/3 of the large intestine
what does the vagal nerve use to supply all the organs in the abdominal cavity
celiac, superior mesenteric and renal plexuses
the left vagus nerve becomes the anterior vagal trunk after entering the abdominal cavity through the esophageal opening, what organs does it inervate?
stomach, liver, pancreas, superior part of the doudenum
branches of the vagus that are distributed via the plexuses carry what
preganglionic parasympathetic and sensory
the anterior branch of the pulmonary plexus receives sympathetic fibers from where
cervical sympathetic ganglia (stallae)
the posterior branch of the pulmonary trunk receives its sympathetic fibers from where
thoracic ganglia (2-5,6) (sympathetic chain)
the stallae ganglion is the fusion of what
the lowest cervical and upper most thoracic
where are postganlionic cell bodies found?
ganglion in the abdominal cavity and the wall of the target organ
