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SAM Special Senses
Terms in this set (10)
What structures dampen loud sounds?
Tensor Tympani and stapedius mm contact reflexly to dampen loud sounds
What surrounds the cochlea?
Where do the sound waves travel?
Sounds waves travel up the cochlea in the scala vestibuli and travel back down through the scala tympani
What is the pathway to produce action potential in vestibular nerve?
1. Arrival of pressure wave bends steriocilia (hairs)
2. Potassium channels open in response to bending
3. Membrane depolarizers due to influx of K+
4. Depolarization triggers inflow of calcium ions
5. Ca2+ causes synaptic vesicles to fuse with plasma membrane
6. Neurotransmitter is released and diffuses to afferent neuron
What type of hearing often gets decreased first?
HIGH PITCH (high frequency waves) (20,000Hz)
What is the difference between conductive and sensorineural hearing loss?
Conductive is Impaired conduction of sound waves in outer or middle war EX: ear wax, ruptured tympanic membrane, middle ear fluid, otosclerosis. Sensorineural is Impaired function in organ of corti CN8, or auditory pathway EX: perbycusis, noise induced damage to organ of corti, peripheral or central lesions (tumors), infections, ototoxins (some ABX)
What is a function of the semicircular canal?
Helps the eyes stay focused on something while moving the head in a different direction. ...Eyes tun in opposite direction of head rotation, effect is to enable you to maintain eye contact on an objection when the head moves.
What causes a reflex when someone pushes you?
Vestibular System and it is relayed through the vestibular ganglion to the parietal lobe of the brain
What can taste and smell elicit in humans?
Memory and emotion—> taste and smell send info to phylogenetically older areas of the brain associated with memory and emotion.
What are the 5 taste modalities?
Sweet, Salty, bitter, sour, and Umami
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