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CN Testing 2

Cranial Nerve Testing

Lines coming down from the either side of the nose towards the corners of the mouth Nasolabial fold
CN that control the muscles that closes the eyelids CN VII
CN that control the muscles that opens the eyelid CN III
The right and left upper motor neurons each innervate both-----that allow the forehead to move up and down Right and left lower motor neurons
The lower motor neuron that control the muscles of the lower face are only innervated by the upper motor neuron from the ----- of the face Opposite side
Dysfunction in CN VII that usually occurs in CNS event such as stroke UMN Dysfunction
Acute CN VII peripheral nerve palsy Bell's palsy
What form of dysfunction in CN VII is seen in Bell's palsy LMN Dysfunction
Dysfunction in CN VII, note preserved ability to wrinkle forehead, left corner of mouth is slightly lower than right, left nasolabial fold is slightly less pronounced compared with right Right central CN VII Dysfunction
Dysfunction in CN VII note loss of forehead wrinkle, ability to close eye, ability to raise corner of mouth and decreased nasolabial fold prominence on left Left peripheral CN VII dysfunction
Bell's palsy tends to happen in patient's----and often responds to treatment with---- Over 50 yrs old Acyclovir and prednisone
Also responsible for carrying taste sensation from the anterior 2/3 of the tongue CN VII
CN VIII Acoustic Nerve
CN VIII carries sound impulses from the Cochlea to brain
Phases of hearing Conductive phase Sensorineural Phase
Phase in hearing which refers to the passage of sound from the outside to the level of CN VIII; this includes the transmission of sound through the external canal and middle ear Conductive phase
Phase in hearing which refers to the transmission of sound via CN VIII to the brain Sensorineural phase
----Hz of tuning fork 512 Hz
During Weber test, when the patient heard the sound better on one side of the ear than the other referred as Lateralizing on a side
Conductive defects can be determined through what procedures Weber test Rinne Test
In rinne test, ---- is a better conducting medium than bone Air
In weber test, tuning fork is placed on the Patient's skull
In rinne test, tuning fork is placed on Mastoid bone
Type of hearing loss is due to wax in external ear Conductive hearing loss
Type of hearing loss is due to a tumor of CN VIII Sensorineural hearing loss
Final pathway through which sound is carried to the brain CN VIII
CN IX Glossopharyngeal nerve
CN X Vagus nerve
Nerves responsible for raising the soft palate of the mouth and gag reflex CN IX, CN X
A protective mechanism which prevents food or liquid from traveling into the lungs Gag reflex
A midline structure hanging down from the palate Uvula
If CN IX on the right is not functioning the uvula will be pulled to the Left
Two major clinical situations indicating the need for gag reflex Sudden decreased level of consciousness Acute dysfunction (stroke, recurrent pneumonia)
CN 12 Hypoglossal nerve
CN responsible for tongue movement CN 12
Each CN 12 innervates 1/2 of the tongue
If right CN 12 is dysfunctional the tongue will deviate to the Right
Movement the begins with an impulse generated by cell bodies located in the brain Voluntary movement
Other term for corticospinal tract Pyramidal tract
Signals travel from cell bodies located in the brain down to their respective axons forming Corticospinal tract
The nerves which comprise the motor pathway of corticospinal tract are collectively referred as Upper motor neuron
At a specific point in the spinal cord the axon synapses with a second nerve referred as
If the LMN terminates in the hand, the synapse occurs in Cervical spine
If the LMN terminates in the foot, the synapse occurs in Lumbar spine
UMN are part of the CNS
Composed of neurons whose cell bodies are located in the brain or spinal cord CNS
LMN are part of the PNS
Made up of motor and sensory neurons with cell bodies located outside of the brain and spinal cord PNS
Nerves which carry impulses away from CNS Efferent
Nerves which carry impulses towards CNS Afferent
Bundles of axons are referred as Spinal nerve roots
Spinal nerve roots contains----- Both afferent and efferent fibers
Paired openings that allow the spinal nerve roots that allow for their passage out of bony projection provided by vertebral column Neuroforamina
Created by: analyncosim



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