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kait1217
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vestibulocochlear nerve function
sensory nerve for hearing (cochlear nucleus) and balance (vestibular nucleus)
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Lesions of CN VIII
tinnitus, impairment or loss of hearing, vertigo (upset balance)
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Conductive deafness
involves external or middle ear
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Sensorienural deafness
from disease in cochlear or pathway from cochlea to the brain
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Glossopharyngeal nerve divisions
visceral sensory and special sensory
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Glossopharyngeal functions
afferent supply of tongue and pharynx, motor to stylopharyngeus, and parasympathetic to parotid
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lesion of glossopharyngeal nerve
loss of sensation from the pharynx, loss of gag reflex, loss of taste from posterior 1/3rd of tongue
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lesions of vagus nerve
weakness of the pharyngeal and laryngeal muscles, loss of cough reflex
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Injury to recurrent laryngeal nerve
hoarseness and dysphonia (unilateral, aphonia and inspiratory stridor (bilateral), lft is more commonly injured
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Spinal accessory nerve is
spinal and accessory cranial nerve roots joined
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Spinal accessory nerve supplies
trapezius and SCM, neck and shoulder movement
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injury to spinal accessory nerve
weakness and atrophy - difficult to turn chin up (SCM) and difficult to raise shoulder (Trapezius), scapular winging
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when is spinal accessory nerve at risk for injury?
surgery for lymph node biopsy, cannulation of internal jugular vein, carotid enarterectomy
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Hypoglossal nerve supplies
muscles of the tongue, movement of the tongue
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Damage to hypoglossal nerve
weakness, fasciculations, deviation of the tongue (ipsilateral); central lesions cause deviation to opposite side
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