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Second order neuron
conducts the impulse from the brainstem- spinal cord to the thalamus (ALWAYS ENDS IN THE THALAMUS)
Two general pathways that carry somatic sensory nerve impulses
Posterior column medial lemnisus pathway, Anterolateral/ spinothalamic pathway.
Posterior column medial lemnisus pathway
carries nerve impules for propioception touch, pressure, and vibration.
If it comes from the lower half of the body more towards the middle of the spinal cord (medial)
pathway: first order neurons
Extends from the receptor enters one of the two tracts in the spinal cord and ends in the medula oblongota
pathway: seconds order neurons
extends from the medula oblongota and crosses over and extends up to the thalumus.
pathway: third order neuron
extends from the thalumus up to the primary somatosensory area of the cortex.
spinothalamic: sedond order neuron
extends from spinal cord and crosses over within- lateral/ anterior tract- thalamus.
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