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Acoustic Reflex

Audiology PowerPoint 6

TermDefinition
Sensory innervation of the facial (VII) cranial nerve taste from the anterior 2/3 of the tongue
Motor innervation of the facial (VII) cranial nerve all muscles of facial expression and the stapedius muscle of the middle ear. Also sends motor impulses to the rest of your ear.
Functions of the facial (VII) cranial nerve facial expression, taste, salivation, lachrymation, prevention of acoustic injury
Pathology of the facial (VII) cranial nerve facial paralysis, loss of taste, dry mouth, loss of tears, acoustic trauma
Noise must be at least __ dB to activate the facial nerve. 85
Ipsilateral reflex reflex of the stapedial muscle on the same side that the loud noise was introduced on
Contralateral reflex reflex of the stapedial muscle on the opposite side from where the loud noise was introduced
In a tympanogram where you contracted the stapedial muscle, you should see... A-s type indicating a stiff system. You should see a decrease in the peak of compliance; more impedance.
When testing for the ipsilateral reflex, the tympanometry and the loud noise should be... on the same side.
When testing for the contralateral reflex, the tympanometry and the loud noise should be... on opposite sides. The loud sound should be on the ear you are not testing.
Your patient has a cochlear lesion on the right side. Impedance is measured on the right. Ipsilateral ART is absent, contralateral ART is present
Your patient has a lesion on the left facial nucleus. Impedance is measured on the right. Both ipsilateral and contralateral ART are present.
Your patient has a lesion on the left facial nucleus. Impedance is measured on the left. Both ipsilateral and contralateral ART are absent.
Created by: 100000299709410
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