EX3 Neuro - CN V and VII Flashcards by Courtney Kast

In which nucleus would you find the SVE component of the facial nerve

facial motor nucleus

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In which nucleus would you find the GVE component of CN VII and what branch of autonomins

superior salivatory nucleus

parasympathetic

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In which ganglion would you find the GVE component of CN VII

submandibular ganglion

pterygopalatine ganglion

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In which nucleus would you find the GSA component of CN VII

trigeminal spinal nucleus

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In which ganglion would you find the GSA component of CN VII

geniculate ganglion

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In which nucleus would you find the SVA component of CN VII

solitary nucleus

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In which ganglion would you find the SVA component of CN VII

geniculate ganglion

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In which nucleus would you find the GVA component of CN VII

solitary nucleus

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In which ganglion would you find the GVA component of CN VII

geniculate ganglion

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How do the functional components of CN VII compare with CN IX and X

they are the same functional components

share the same cell body origin in the solitary nucleus (SVA) and trigeminal spinal nucleus (GSA)

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This component of CN VII is responsible for the muscles of facial expression

SVE

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This component of CN VII is responsible for the cranial parasympathetics

GVE

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This component of CN VII is responsible for the skin of the ear; pain, touch, temperature

GSA

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This component of CN VII is responsible for taste to the anterior 2/3 of the tongue

SVA

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This component of CN VII is responsible for the visceral sensibility of the palatine tonsil and posterior nasal cavity

GVA

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What makes up the facial nerve proper

SVE fibers

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What makes up the nervus intermedius of VII

GVE and sensory fibers

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What is the course of the facial nerve out of the skull

from the skull though stylomastoid foramen

pass through parotid gland where a plexus forms

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This nucleus is the parasympathetic component in the nervus intermedius

superior salivatory nucleus

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These nerve branches of CN VII are part of the parasympathetic component of nervus intermedius

greater petrosal

chroda tympani

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The greater petrosal nerve is associated with which nucleus

pterygopalatine nucleus

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The chroda tympani is associated with which nucleus

submandibular gland - salivation

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This is responsible for closing the eye (closing lips)

opening the eye?

SVE; muscles of facial expression

opening = CN III

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The stapedius muscle controlled by SVE does what

modulates sound volume

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Salivation is controlled by what component

GVE

Lacrimation is controlled by what component

GVE - lubricates cornea

Which glands are innervated by CN VII

lacrimal submandibular sublingual

This is the irritation of the cornea and paresis (partial paralysis) of facial muscles above and below the eye (SVE)

Bell's Palsy

What are some additional symptoms of Bell's Palsy

hyperacusis (increased sensitivity to noise) reduced lacrimation and salivation crocodile tears numbness or pain of the ear, tongue, or face

What causes Bell's Palsy

lesion of the facial nerve; acute facial nerve paralysis will be on the same side of the lesion

What is the result of facial nerve paralysis involving Ball's Palsy

paralysis is complete over half the face on same side of lesion

What will result as a lesion to the facial nerve in the internal auditory canal

all facial nerve components run through the internal auditory canal, a lesion can damage all components (motor and sensory)

What will result as a lesion to the facial nerve in the facial canal

lesion can damage all components (motor and sensory); chorda tympani/facial nerve branches can also be damaged from periphery

What will result as a lesion to the facial nerve in the stylomastoid foramen

damage/paralysis to the muscles of facial expression (SVE) and GSA (skin of ear)

A lesion of the upper motor neuron in the corticobulbar tract results in this

``` opposite side (contralateral) weakness to the lower face and sparse weakness to upper face; eye movements not effected ```

A lesion of the lower motor neuron in the facial nucleus results in what type of paralysis

ipsilateral; both lower and upper face affected; eye movements effected

This is a result of the parasympathetic fibers to submandibular ganglion being re-routed to pterygopalatine ganglion

Crocodile tears; unilateral tearing in anticipation of, and during meals history of Bell's palsy

This is a result of a surpanuclear lesion (above nucleus)

paralysis of muscles of facial expression below the level of the eye opposite the lesion

In which nucleus would you find the SVE component of CN V (cell body of origin)

trigeminal motor nucleus

What is the cell body of origin /nucleus of the GSAp and GSAe component of CN V and where does it terminate

unipolar cell bodies; trigeminal mesencephalic nucleus (GSAp) terminate - trigeminal spinal and principal (GSAe)

What is unique about the GSA component of CN V (trigeminal mesencephalic nucleus)

Do not have cell bodies in spinal cord ganglia or cranial nerve ganglia

What does the SVE component of trigeminal control

muscles of mastication

What does the GSA component of trigeminal control

propriception of the muscles of mastication pressure/tension of periodontal ligaments sensation; skin of face, oronasal mucous membranes, teeth, dura mater, pain crude touch, temperature

What are the three divisions of the trigeminal nerve

opthalmic (I) maxillary (II) mandibular (III)

What region is served by the ophthalmic division of trigeminal

upper face | sensory only

What region is served by the maxillary division of trigeminal

``` middle face (above mouth, below eyes) sensory only ```

What region is served by the mandibular division of trigeminal

lower face | sensory and motor

What cranial nerves besides trigeminal contribute axons to the trigeminal spinal tract and terminate in the trigeminal spinal nucleus (pars caudalis)

VII - ear IX - ear X - ear

What is meant by the somatototopic organization of the trigeminal spinal tract

it means that there are clear divisions between the divisions of trigeminal; like an onion - a certain portion of the face is directly correlated tot a certain portion of the spinal tract/nucleus

Where is the trigeminal mesencephalic nucleus found

rostral pons and mesencephalon adjacent to the ventricle | - midbrain

Where is the trigeminal motor nucleus found

dorsolateral pontine tegmentum | - pons

Where is the trigeminal spinal nucleus found

pons

Where is the trigeminal principal sensory nucleus found

pons

What are the two ascending projections from the trigeminal sensory nuclei (trigeminal spinal nucleus and trigemin pontine (principal) sensory nucleus)

ventral trigeminothalamic dorsal trigeminothalamic project to ventral posteriomedial nucleus (VPM)

What is different about the ventral and dorsal trigeminothalamic pathways

ventral projects contralaterally to VPM; pain, touch temp dorsal projects bilaterally to VPM; pressure, discriminatory touch but both give off fibers to nearby reticular formation

Where is the VPM located and project into

thalamas, projects into the post central gyrus

This is the heavily myelinated homologue of the posterior column - medial lemniscal system; proprioception

trigeminal mesencephalic nucleus

This is the heavily myelinated homologue of the posterior column - medial lemniscal system; discriminative touch

trigeminal principal nucleus

This is the lightly myelinated homologue of the anteriolateral system; pain, crude touch, temperature

trigeminal spinal nucleus

This stimulates the cornea and the ispsilteral eye closes

direct corneal reflex

This stimulated the cornea and the contralateral eye closes

consensual corneal reflex

The trigeminal nerve projects where to stimulate the cornea

trigeminal principal nucleus | trigeminal spinal nucleus

Which trigeminal nucleus relays bilaterally to facial nucleus (involving corneal reflex)

trigeminal spinal nucleus

What is the jaw-jerk reflex

the tapping of a persons jaw at the chin to test the trigeminal nerve innervating the masseter; myotatic

This will cause the jaw-jerk reflex to become exaggerated

upper motor neuron lesion accentuates reflex | lower motor neuron lesion lessens reflex

This is usually unilateral, excruciating, lancing (spontaneous) pain affecting the ophthalmic (<5%) and mandibular division

trigeminal neuralgia

What can affect trigeminal neuralgia

``` compression of nerve trigger point onset of middle age often response to drug the ape microvascular decompression may be effective ```

What is trigeminal tractotomy

the severing or transection of the trigeminal nerve to relieve pain

This regions of the trigeminal spinal nucleus involves input from the oral cavity

pars oralis

This region of the trigemninal spinal nucleus involves input from the trigeminal autonomic reflex

pars interpolarsi

This region os the trigeminal spinal nuclues is important in pain processing

pars caudalis