Neuro pt 4 Flashcards
What are the 3 levels of processing sensory information
Receptor,circuit and perceptual
How do you generate a signal at the receptor level
A stimulus matches the receptor within the receptive field.
A transduction transforms into a graded potential,
The graded potential needs reach threshold
What does graded potential mean
free dendrites or encapsulated receptors
what are receptor potential
they are used for special senses
What is adaptation
reduction of sensitivity when presented with a constant stimulant ( NOT PAINFUL)
Where is peripheral adaptation found
it is found at the receptor level and REDUCES info to the CNS
What are phasic receptors
They are fast adapting receptors for special senses
What are tonic receptors?
They are sustained and have no adaptation
What will order one neuron bring
Information to CNS that will synapse with 2nd order.
What will the 2nd order neurons do
they ascend towards the brain
what will 3rd neurons do
Their cell bodies will take the info to the right sensory area.
Name the 3 main pathways for somatosensory info
Dorsal column-medial lemniscal,spinothalamic,spinocerebellar
what do Dorsal pathways do
their target is the thalamus with a single type of receptors, which can be localized on the body’s surface
What do spinothalamic pathways do
They target the thalamus with several types of receptors and are not localized by a source easily.
What do spinocerebellar pathways do
They target the cerebellum and they send info to the muscle or tendon to COORDINATE ( not consciously aware)
What is the difference between sensation and perception
the sensation is when you’re aware of changes internal of external
Preception is when you are conscious