Perception Flashcards
what are the three main levels of neural integration in the somatosensory system
Receptor level
circuit level
perceptual level
what is in the receptor level
sensory receptors
what is in the circuit level
ascending pathways
fine touch runs up the _______ column to reach the medulla
dorsal white column
is the dorsal white column a descending tract or an ascending tract
ascending tract
from and to where does a first order neuron conduct impulses
from the skin to the spinal cord or brain stem
where does the cell body of a first order neuron reside
in a dorsal root of the spine or cranial ganglia
where is the sensory tip of the first order neuron
just into the peripheral nervous system
where are third order neurons located
in the thalamus
where do third order neurons conduct impulses to
the somatosensory cortex
where is the cell body of the second order neurons
either in the dorsal horn of the spinal cord or the medullary nuclei
what is the pathway taken by pain and temperature
spinothalamic
what kind of neurons are in the spinothalamic pathway
second order
where do second order neurons transmit signals
to the thalamus or cerebellum
where does fine touch impulses go to
directly to brain stem into medulla
what is the primary sensory neuron of vision
bipolar cell
what is the second order neuron in vision
ganglion cell
what is the primary sensory neuron of hearing
bipolar cell in spiral ganglion
what is the second order neuron in hearing
the superior oliveri nucleus in hte brain stem
what is the key point about a second order neuron
they cross the midline
what is the word to describe crossing the midline
decussation
What pathway has second order neurons in the spinal cord
spinothalamic
what pathways has second order neurons in the medulla
dorsal column
what pathway does fine touch go through
dorsal column pathway
where does decussation occur for fine touch
in the brain stem (medulla)
what nerve innervates muscles for mastification
trigeminal nerve
what is perceptual detection
detecting that a stimulus has occured
what is magnitude estimation
how much of a stimulus is acting
what is spatial discrimination
identifying the site or pattern of the simulus
where does the thalamus project fibers to? (2)
somatosensory cortex
sensory association areas
what is feature abstraction
used to identify a substance that has a specific texture or shape
what is quality discrimination
ability to identify sub modalities of a sensation (sweet or sour)
what is basal nuclei responsible for
movement initiation
what is the lowest level of motor control
segmental level
what is the highest level of motor control
precommand level
what is the middle level of motor control
projection level
