Free nerve endings - A delta and C fibres.
A delta - unmyelinated - fast - sharp
C - myelinated - slow - dull/burning
go to subsantia gelatinosa - (modulates sensory input acc gate control theory) in dorsal horn of spinal cord thru Lissauer's tracts
Decussate and ascend contra laterally and reach thalamus mainly and other parts of brain.
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