somatic sensation fisrt order
detect the sensation dorsal root ganglion in body outside the spina cord.
seond order of somatic sensation
in the spinal crd, transmit message to brain
somatic sensation third order is in
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
sensoryneurons on face and cranial structures are transmitted by
trigeminal sensory neurons
Limbs and trunk somatosensory information is transmitted by
dorsal root ganglion neurons
sensory impulses travel up
spinal nerves to the spinal cord
second-order neurons carry sensory impulse to the
second order neurons communicate with various
2ns order neurons also communicate with
sensory pathways in the spinal cord and contain the ascending pathways that travel to the thalamus
third order neurons relay information from teh thalamus to the
third order neurons carry sensory impulse
to the cortex
primary somatosensory cortex identifies
association cortex relates sensation to
memories other sensations ect...
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
3 of the 3 main pathways of anterolater system
tectum, orients the eyes and head toward the stimuli
affects arousal, mood attention
paleospinothalamic tract goes to
reticular activationg system
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
neospinothalamic tract goes to the
thalamus and parietal cortex
neospinothalamic tract allows
localization and identification of pain
neospinothalamic system interconnections
between the lateral thalamus and the somatosensory cortex are necessary toadd precision and discrimination to the pain sensation
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