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somatic sensation fisrt order
detect the sensation dorsal root ganglion in body outside the spina cord.
general somatic afferent neurons
throughout the body, distinct types of receptors such as pain, touch, and temerature
special somatic afferent neurons
located primarily in muscles, tendons and joints, sense position and movement in the body
general visceral afferent neurons
receptors on various visceral structures and sense of fulness and discomfort
2ns order neurons also communicate with
sensory pathways in the spinal cord and contain the ascending pathways that travel to the thalamus
the association cortex lets you know
nail in foot, ouch, remove nail and avoid steping on another one
in the nervous system, the anterolateral systme is an ascending pathway that conveys pain, temperature, and crude touch from teh periphery to the brain. It comprises 3 main pathways
3 main pathways of anterolater system
spinothalamic tract to the thalamus which is important in the localizationof painful or thermal stimuli
2 of the 3 main pathways of anterolater system
reticular formation- causes alertness and arousal in response ot painful stimuli
paleospinothalamic tracts are
slower conducting, multisynaptic pathways concerned with the diffuse, dull aching and unpleasant sensations that that commonly are associated with chronic and visceral pain.
Fibers of the paleospinothalamic tract terminate widely in the
brain stem and only 1/10 to 1/4 pass directly ot the thalmus.
Paleospinothalamic tract teminate pricipally in
the rectiular formation in the medulla, pons and midbrain
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