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Puder Cranial Nerves #2
Terms in this set (27)
CNVII; name and four modalities
-Branchial motor efferents to the muscles of facial expression
-Visceral motor efferents (parasympathetic) to glands and mucous membranes
-General sensory afferents from ear
-Special sensory afferents (taste from anterior 2/3 of tongue)
What CN gives taste from anterior 2/3 of tongue?
What CN does all facial excretions (except one of the salivary glands?)
the parasympathetic portion of CN VII
(CN IX does that random salivary gland)
Path of CN VII in a brainstem slide
The top of the snowman is the face, thus the location of the facial nucleus (can see three white blobs on top of each other)
Note that it wraps around the abducens nucleus on the bottom of the picture
Note: anything that is sensory (pain) has to go into the trigeminal nuclei to synapse
When taste is relayed from the tongue (CN VII), where does it synapse?
Solitary nucleus & tract is a visceral sensory center; any visceral sensation has to synapse on the solitary nucleus
("Cell bodies are located in the geniculate ganglion. Axons project to the medulla and synapse in the nucleus solitarius."
What does a lesion to facial motor nucleus of CN VII cause?
ipsilateral paralysis of face = Bell Palsy
Blink reflex would also be nonfunctional as CN VII closes eyelids/blinks
What does a lesion to visceral motor pathway (parasympathetic) of CN VII cause?
lack of production of tears, nasal mucous, & saliva
Lesion to the special sensory axons of CN VII will result in what?
Loss of taste = Aguesia
CNVIII; name and function
; special sensory afferent for
(balance and posture) and
CNIX; name and 5 modalities
; posterior 1/3 of tongue, skin and external ear, internal surface of tympanic membrane and pharynx
; from carotid body and sinus
-Special sensory; taste from posterior 1/3 of tongue
-Branchial motor; to stylopharyngeus muscle
-Visceral motor; parasympathetic to
What CN gives taste from posterior 1/3 of tongue?
Path of CN IX (special sensory) in a brainstem slide
(because of tastes, both CN VII and IX synapse at the
("Cell bodies are located in the inferior glossopharyngeal ganglion and axons project and synapse on the nucleus solitarius in the medulla")
Path of CN IX (motor) in a brainstem slide
synapses on the
Note: most cell bodies in nucleus ambiguous are from CNX
("Corticobulbar (corticonuclear) tracts synapse bilaterally on the rostral nucleus ambiguous which contains cell bodies of the lower motor neurons that innervate the stylopharyngeus muscle)
What is Glosspharyngeal neuralgia?
Sharp, lancinating pain in tonsil region that radiates to ear; pain triggered by yawning or swallowing. No cause can usually be identified, but sometimes is caused by compression of CN IX caused by carotid aneurysms, oropharyngeal malignancies, peritonsillar infections, or lesions at the base of the skull
What nerve initiates the gag reflex?
CN IX; glossopharyngeal
Reflex initiated by CNIX, which relays sensation from back of mouth. The info is relayed to CN X and XII to close respiratory and alimentary passages and protrude the tongue to expel the object
Prevents food and water from entering the alimentary and respiratory passages
CNX; name and four modalities
; posterior meninges, external ear, pharynx and larynx
; from larynx, trachea, esophagus, thoracic and abdominal visceral, stretch and chemoreceptors in aortic arch and body
; to muscles of the larynx and pharynx
; to smooth muscles and glands of laynx and pharynx, thoracic and abdominal viscera and cardiac muscle
Majority of functionality is visceral sensory
Where do cell bodies located in the inferior vagal ganglion synapse re: CNX visceral sensory pathway?
Image description: Mid-medulla section depicting CNX relaying visceral sensory info into the medulla via the solitary tract and then synapsing on the solitary nucleus which projects its axons to the hypothalamus, then thalamus
What three CN's synapse at the nucleus solitarius? What info are they carrying?
CN VII, IX, X
Carrying visceral sensation info
What contains cell bodies of motor efferents of CN X? Where are they?
The nucleus ambiguous sends out axons to the muscles; CNX synapses on the nucleus ambiguous
NOTE: This is one of the areas that is nourished by the PICA; thus, it is affected by a PICA stroke and innervation to larynx and pharynx is lost (dysphagia [difficulty swallowing] and dysarthria [difficulty speaking]).
Visceral motor pathway of CNX
dorsal motor nucleus of vagus = preganglionic
note: postganglionic neuron is on or near the organ it innervates
Where do you always find postganglionic neurons?
on the organ they innervate
What is the motor component of the gag reflex?
CNXI; name and function
Spinal accessory nerve; branchial motor efferent with cell bodies in the anterior horn of spinal cord segments C1-C5
Innervate the sternocleidomastoid and trapezius muscles; raise shoulder ipsilaterally and turn head opposite way
What CN's are a cranial nerve AND a lower motor neuron? What is its upper motor neuron?
CN XI; It's upper motor neuron is cortical bulbar tract
CN XII; cortical bulbar neuron
CN XII; name and function
Hypoglossal nerve; innervates all the tongue muscles on the same side
CN XII; what/where is its nucleus?
Hypoglossal nucleus, which contains cell bodies of LMNs that project their axons through the hypoglossal canal to innervate intrinsic and extrinsic tongue muscles
What are you checking for when you ask someone to stick out their tongue?
CN XII lesion
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