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Cranial Nerves
Cranial Nerves
127
Anatomy
Graduate
04/06/2015

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Term
which cranial nerves do not originate in the brain stem
Definition
CN I, CN II
Term
Generally sensory nerve nuclei tend to e located where
Definition
lateral brainstem
Term
motor nuclei tend to be located where
Definition
medial brainstem
Term
if a cranial nerve has mixed sensory and motor fibers, what does in mean in terms of their nucleus of origin
Definition
it has more than one, at least one sensory, and one motor
Term
sometimes more than one nerve will orginate from a single nucleus, such as what
Definition
sense of taste is spread across at least 2 nerves but merges into a single nucleus
Term
edinger westphal nucleus is associated with what CN
Definition
CN III
Term
what are the pure motor CN?
Definition
CN III, CN IV, CN VI
Term
CN III, CN IV, CN VI innervate what
Definition
extrinsic eye muscles
Term
CN III innervates what eye muscles (4)
Definition
superior recti, inferior recti, medial rectus, inferior oblique
Term
damage to CN III would present as what
Definition
eye pulling down and out
Term
CN III fibers exit ventrally just inside what structure
Definition
peduncles
Term
nucleus that is the source of parasympathetics to the eye
Definition
edinger-westphal nucleus/accesory oculomotor
Term
the edinger-westphal nucleus/accessory oculomotor is located medial to what structure
Definition
oculomotor nuclei
Term
damaging these types of fibers that also travel in CN III will produce a dilated pupil
Definition
parasympathetic fibers
Term
what type of drops are given to you by the doctor to inhibit the parasympathetic system and induce pupil dilation
Definition
aceycholine antagonist (blocker)
Term
pupil dilation prevents this lens reflex
Definition
accomodation (focus on close objects)
Term
CN IV innervates what
Definition
superior oblique
Term
CN IV unique property 1: exits where
Definition
brainstem dorsally
Term
CN IV unique property 2: how does it travel when it exits? where?
Definition
crosses on the way out. fibers cross over each other in the roof of the 4th ventricle
Term
CN IV unique property 2: how does it travel when it exits? where?
Definition
crosses on the way out. fibers cross over each other in the roof of the 4th ventricle
Term
CN VI innervates what
Definition
lateral rectus
Term
facial nerve fibers travel dorsally to what structure
Definition
4th ventricle
Term
facial nerve fibers travel dorsally to the floor of the 4th ventricle, loop over what
Definition
abducens nuclei
Term
facial nerve fibers travel dorsally to the floor of the 4th ventricle, loop over the abducens nucleus, and dive back ventrally into what
Definition
the pons
Term
all of the muscles of facial expression are innervated by what
Definition
facial nerve
Term
why is the facial nerve considered a mixed cranial nerve
Definition
carries sensation of taste
Term
the facial nerve also carries what types of fibers to the salivary glands
Definition
parasympathetic glands
Term
where do facial nerves become myelinated
Definition
after looping around the abducens nucleus
Term
where are facial nerve fibers not myelinated
Definition
from the facial nucleus prior to looping around the abducens nucleus
Term
the facial nerve carries taste sensation for what part of the tongue
Definition
anterior 2/3
Term
touch and pain sensation from the tongue is via what CN
Definition
CN V
Term
motor to the tongue is supplied by what CN
Definition
CN XII
Term
regardless of origin, taste fibers enter the ________ _______ of the medulla
Definition
solitary tract
Term
regardless of their origin, taste fibers enter the solitary tract of the ______
Definition
medula
Term
taste fibers enter the solitary tract of the medulla and synapse in the surrounding....
Definition
solitary nucleus
Term
taste and touch sensation from the back of the throat are carried by what CN
Definition
CN IX
Term
Taste sensation from the glossopharyngeal nerve synapse where?
Definition
solitary nucleus
Term
touch sensation of CN IX can lead to what reflex
Definition
gag reflex
Term
CN that emerges from the medulla as the most rostral of a series of rootlets that emerge between the olive and ICP
Definition
CN IX
Term
Motor impulses from the glossopharyngeal nerve descend in what tract
Definition
corticobulbar tract
Term
CN IX motor impulses descend in the corticobulbar tract through what structure
Definition
internal capsule
Term
CN IX motor impulses descend in the corticobulbar tract through the internal capsule to synapse ______ on LMN in the nucleus ambiguus
Definition
bilaterally
Term
cn IX motor impulses descend in the corticobulbar tract through the internal capsule to synapse bilaterally on what types of motor neurons in the nucleus ambiguus
Definition
Lower Motor Neurons
Term
cn IX motor impulses descend in the corticobulbar tract through the internal capsule to synapse bilaterally on lower motor neurons in the _______ _______
Definition
nucleus ambiguus
Term
cn IX motor: axons from the LMN in CN IX then innervate what muscle
Definition
stylopharyngeus muscle
Term
action of the stylopharyngeus muscle
Definition
elevates the pharynx during swallowing and speech
Term
cn IX motor: stimuli from the hypothalamus such as dry mouth for fear, and salivation in response to odors descend to what?
Definition
inferior salivatory nucleus
Term
CN IX motor: these fibers located in the inferior salivatory gland join other components of CN IX and exit the medulla (2 words)
Definition
preganglionic parasympathetic
Term
CN IX motor: preganglionic parasympathetic fibres located in the inferior salivatory nucleus join other components of CN IX and exit what?
Definition
the medulla
Term
CN IX motor: the tympanic nerve leaves what
Definition
inferior ganglion
Term
CN IX motor: tympanic nerve leaves the inferior ganglion and travels to what
Definition
middle ear
Term
CN IX motor: tympanic nerve supplies sensation to what structures (3)
Definition
mucous membrane of the middle ear, auditory tube, mastoid
Term
CN IX motor: tympanic nerve gives off this nerve that contains actual visceral motor fibers
Definition
lesser petrosal
Term
CN IX motor: the lesser petrosal nerve synapses where
Definition
otic ganglion
Term
CN IX motor: from the otic ganglion these fibers join the auriculo-temporal nerve (2 words)
Definition
postganglionic parasymapthetic
Term
CN IX motor: from the otic ganglion postganglionic parasympathetic fibers join what nerve
Definition
auriculo-temporal nerve
Term
auriculo-temporal nerve is a branch of what CN
Definition
It is the the 3rd branch of CN V
Term
CN IX motor: from the otic ganglion postganglionic parasympathetic fibres join the auriculo-temporal nerve to supply these fibers to the parotid gland
Definition
secretomotor
Term
CN IX motor: from the otic ganglion postganglionic parasympathetic fibers join the auriculo-temporal nerve to supply secretomotor fibers to what (2)
Definition
parotid gland
Term
CN IX Visceral Afferents: Chemoreceptors detect what
Definition
O2 tension
Term
CN IX Visceral Afferents: chemoreceptors from what structure sends information to the inferior ganglion via the carotid nerve
Definition
carotid body
Term
CN IX Visceral Afferents: chemoreceptors from the carotidy body send information to what structure via the carotid nerve
Definition
inferior ganglion of glossopharyngeal nerve
Term
CN IX Visceral Afferents: chemoreceptors from the carotid body send information to the inferior ganglion of glossopharyngeal nerve via what
Definition
carotid nerve
Term
CN IX Visceral Afferents: baroreceptors in what structure send information to the inferior ganglion of glossopharyngeal nerve via the carotid nerve
Definition
carotid sinus
Term
CN IX Visceral Afferents: baroreceptors in the carotid sinus send information to what structure via the carotid nerve
Definition
inferior ganglion of glossopharyngeal nerve
Term
CN IX Visceral Afferents: baroreceptors in the carotid sinus send information to the inferior ganglion via what
Definition
carotid nerve
Term
CN IX Visceral Afferents: information from the inferior ganglion, what kind of processes travel to the nucleus solitarius
Definition
central processes
Term
CN IX Visceral Afferents: central processes from the inferior ganglion of the glossopharyngeal nerve travel to what via the tractus solitarius
Definition
nucleus solitarius
Term
CN IX Visceral Afferents: central processes from the inferior ganglion of glossopharyngeal nerve travel to the nucleus solitarius via what
Definition
tractus solitarius
Term
CN IX Visceral Afferents: from the nucleus solitarius connections are made with what 2 structures
Definition
reticular formation, hypothalamus
Term
CN IX Visceral Afferents: from the nucleus solitarius, connections are made with the reticular formation and hypothalamus for the appropriate reflex control of what 3 processes?
Definition
respiration, BP, cardiac output
Term
CN IX General Sensation: Neurons that carry pain and temperature from skin part of external ear, inner surface of tympanic membrane, posterior 1/3 of tongue, and upper pharynx have their cell bodies in either of these 2 structures
Definition
superior glossopharyngeal ganglia, inferior glossopharyngeal ganglia
Term
CN IX General Sensation: central processes from the superior/inferior glossopharyngeal ganglia descend in what tract
Definition
spinal tract of V
Term
CN IX General Sensation: central processes from the superior/inferior glossopharyngeal ganglia descend in the spinal tract of V and synapse in the caudal part of what
Definition
spinal nucleus of V
Term
CN IX General Sensation: second order neurons from the spinal nucleus of V decussate and ascend to what
Definition
Ventral Posteromedial Thalamus
Term
CN IX General Sensation: 3rd order neurons from the ventral posteromedial thalamic nucleus terminate where?
Definition
head region of the post central gyrus
Term
CN IX General Sensation: the pathway for general sensation is suspected for what 2 sensations
Definition
touch, pressure
Term
CN IX General Sensation: this pathway is suspected for touch/pressure and is important in what reflex
Definition
gag
Term
CN IX Special Sensation: taste sensation from the posterior 1/3 of the tongue is carried to what
Definition
inferior glossopharyngeal ganglion
Term
CN IX Special Sensation: central processes from the inferior glossopharyngeal ganglion enter what
Definition
the medulla
Term
CN IX Special Sensation: central processes from the inferior glossopharyngeal ganglion ascend in what tract
Definition
tractus solitarius
Term
CN IX Special Sensation: central processes from the inferior glossopharyngeal ganglion enter the medulla and ascend in the tractus solitarius to synapse where
Definition
nucleus solitarius
Term
CN IX Special Sensation: from the nucleus solitarius axons then ascend how to the VPM thalami
Definition
bilaterally
Term
CN IX Special Sensation: from the nucleus solitarius axons then ascend bilaterally to what
Definition
VPM thalami
Term
CN IX Special Sensation: third order fibers from the VPM nuclei terminate where
Definition
head region of the post central gyrus
Term
CN IX Special Sensation: where is taste percieved
Definition
head region of the post central gyrus
Term
CN X: how far does CN X wander
Definition
from brain stem to splenic flexure of colon
Term
CN X: exits from the medulla as several rootlets that converge into 2 roots that exit the skull via what
Definition
jugular foramen
Term
CN X: motor nucleus for CN X
Definition
nucleus ambiguus
Term
CN X: cells in the nucleus ambiguus innervate what type of muscle throughout the neck and thorax
Definition
striated
Term
CN X: cells in the nucleus ambiguus innervate striated muscle throughout where
Definition
neck and thorax
Term
CN X: cells in the nucleus ambiguus innervate these specific muscle groups (3)
Definition
muscles of the palate, muscles of pharynx, muscles of the larynx
Term
CN X: the nucleus ambiguus provides parasympathetic innervation to what
Definition
the heart
Term
CN X: problems with the nucleus ambiguus can show up as what 2 S/S
Definition
hoarseness, deviated uvula
Term
CN X: when you open up and say "AHHHHH" what is the role of the vagus
Definition
vagus elevates the soft palate
Term
CN X: if there is damage to CN X which way will teh uvula deviate?
Definition
deviated to the unaffected side
Term
CN X: secretomotor parasympathetic nucleus of CN X
Definition
dorsal nucleus of the vagus
Term
CN X: secretomotor means that it primarily stimulates what
Definition
glands
Term
CN X: dorsal nucleus of the vagus stimulates the glands of these 4 areas
Definition
pharynx, lungs, gut, gastric glands in the stomach
Term
CN X: sensory nucleus of the vagus
Definition
solitary nucleus
Term
CN X: solitary nucleus recieves what information and from where
Definition
taste information, sensation, from the back of the throat, and also visceral sensation
Term
CN X: visceral sensation recieved by the solitary nucleus can include what (4)
Definition
blood pressure receptors, blood-oxygen receptors, sensation, stretch receptors
Term
CN X: visceral sensation recieved by the solitary nucleus includes general sensation from what areas
Definition
larynx and trachea
Term
CN X: visceral sensation recieved by the solitary nucleus includes stretch receptors from what area
Definition
the gut
Term
CN XI motor: where are the lower motor neuron cell bodies of CN XI located
Definition
cervical spinal cord
Term
CN XI motor: motor information from CN XI descends in what tract
Definition
lateral corticospinal tract
Term
CN XI motor : motor information from CN XI descends in the LSCT and synapses where
Definition
accessory nucleus
Term
CN XI: where is the accessory nucleus located
Definition
lateral part of the anterior gray column of the upper 5-6 cervical segments
Term
CN XI motor: from the accessory nucleus, fibers emerge from the spinal cord as a series of rootlets to form what
Definition
accessory nerve
Term
CN XI motor: axons from the accessory portion of CN XI ascend into the cranium via what
Definition
foramen magnum
Term
CN XI motor: axons of the accessory division of CN XI ascend via the foramen magnum and exit the cranium via what
Definition
jugular foramen
Term
CN XI motor: accessory spinal nerve fibers exit the jugular foramen to innervate what 2 muscles
Definition
trapezius, SCM
Term
CN XI motor: CN XI joins with what other CN
Definition
CN X
Term
CN XII: what tongue muscle does CN XII not innervate
Definition
extrinsic muscle palatoglossus
Term
what innervates the extrinsic muscle palatoglossus of the tongue
Definition
CN X
Term
CN XII: corticobulbar fibers synapse predeominately to which hypoglossal nucleus
Definition
contralateral
Term
CN XII: sensory fibers for taste and tactile stimuli from which nuclei (2) also feed into the hypoglossal nucleus
Definition
nucleus solitarius, sensory trigeminal nucleus
Term
CN XII: sensory information for taste and tactile stimuli from the nucleus solitarius and from the sensory trigemnical nucleus feed into the hypoglossal nucleus thereby resulting in these (3) reflexes
Definition
swallowing, sucking, chewing
Term
CN XII: what type of nerve is CN XII
Definition
pure motor
Term
CN XII: what would you ask a patient to do if you suspected a problem with the hypoglossal nerve
Definition
ask the ptnt to stick their tongue out, failure to do so would indicate a CN XII problem
Term
CN XII: what do the tongue muscles actually do to the tongue
Definition
push it forward
Term
CN XII: damage to UMN may result in what S/S
Definition
fasciculation of the tongue without atrophy of the tongue
Term
CN XII: damage to UMN may result in fasciulation of the tongue without atrophy of the tongue muscles on which side
Definition
affected side
Term
CN XII: damage to an UMN would result in what S/S
Definition
tongue deviates to opposite side of lesion
Term
CN XII: damage to the LMN results in what S/S
Definition
flaccid paralysis of teh tongue with atrophy of tongue muscles
Term
CN XII: damage to the LMN results in flaccid paralysis of the tongue with atrophy of tongue muscles on what side
Definition
affected sdie
Term
CN XII: damage to the LMN would result in tongue deviation to what side
Definition
same side as lesion
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