cds 457 wk 9 quiz

OAEs arise from which part of the cochlea?

outer hair cells

which part of the cochlea is responsible for the measurement of OAEs?

external auditory canal

what can negatively impact recording of OAEs? (Little Otters Eat Fish On Icy Polar Nights)

lack of ear canal, obstruction in ear canal, eustachian tube dysfunction, fluid in middle ear, ossicular abnormalities, improper placement of probe tip, patient noise

what can OAEs tell us about the auditory system and what can they not tell us?

the health of the outer hell cells, suggesting the hearing levels are within normal limits. however, normal OAEs does not equal normal hearing

what are the most common reasons for doing an ABR evaluation?

behavioral threshold estimation, young children, newborn hearing screening, follow-up to failed newborn hearing screening, evaluation of possible auditory nerve tumors

what are the interactions between ABR Wave V latency (time) and different frequencies?

latency increases as frequency decreases

is Wave V later or earlier in time for high and low frequencies?

the higher the frequency, the earlier in time it is

what are the 3 mechanisms for balance and movement?

vision, proprioception/somatosensory, and vestibular system

how does the endolymph in the semicircular canals move with different head turns?

head turn to the right causes endolymph to move left, head turn to the left will cause endolymph to move right

which vestibular organs contain otoliths?

utricle and saccule

how is vertigo experienced by someone?

sensation that the room is spinning, or that you yourself are spinning

which vestibular tests do NOT require any formal or expensive equipment? (GRUDHI)

gaze nystagmus, romburg, unterberger, dix-hallpike, head impulse