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
