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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

the brain

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

reflex networks

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

cerebral cortex.

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


pain sense

anterolateral system

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

paleospinothalamic tract

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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