physiology Flashcards
1
Q
what are the stages of hearing?
A
- sound waves channelled through external acoustic meatus -> vibrate tympanic membrane
- tympanic membrane transmits vibrations through ossicles (amplification)
- footplate of stapes vibrates oval window creating pressure waves in perilymph
- hair cells on basement membrane moved, stimulating action potentials
- CN VIII -> superior temporal gyrus
2
Q
what does balance involve?
A
3 semi-circular canals
otolith organs
3
Q
where are taste buds found?
A
papilla on dorsum of tongue, palate, epiglottis, pharynx
fungiform, vallate, foliate papilla contains taste buds
4
Q
when are taste buds replaced?
A
every 10 days
5
Q
what cranial nerve supplies the anterior 2/3 tongue?
A
CN VII
facial nerve
chorda tympani
6
Q
what cranial nerve supplies posterior 1/3 of the tongue?
A
CN IX
glossopharyngeal
7
Q
what cranial nerve supplies epiglottis + pharynx?
A
CN X
vagus
8
Q
what allows for smell?
A
olfactory receptors in olfactory mucosa by cribriform plate of ethmoid bone
9
Q
A
