r C or slow painEfferent nerve fiber/Motor neuronGSEGVESVEUpper motor neuronLower motor neuronα motorneuronβ motorneuronγ motorneuronTerminationSynapseElectrical synapse/Gap junctionChemical synapseSynaptic vesicleActive zonePostsynaptic densityAutapseRibbon synapseNeuromuscular junctionSensory receptorsMeissner's corpuscleMerkel nerve endingPacinian corpuscleRuffini endingMuscle spindleFree nerve endingNociceptorOlfactory receptor neuronPhotoreceptor cellHair cellTaste receptorvteBrain and spinal cord: neural tracts and fasciculiSensoryDCML1°:Pacinian corpuscle/Meissner's corpuscle → Posterior column (Gracile fasciculus/Cuneate fasciculus) → Gracile nucleus/Cuneate nucleus2°:→ sensory decussation/arcuate fibers (Posterior external arcuate fibers, Internal arcuate fibers) → Medial lemniscus/Trigeminal lemniscus → Thalamus (VPL, VPM)3°:→ Posterior limb of internal capsule → Postcentral gyrusAnterolateral/painFast/lateral1° (Free nerve ending → A de