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Spino-thalamic tract

Second order neuron cell body and

dendrites  located  in dorsal  horn ofspinal cord

1st synapse

Second axon crosses cord ventrallyand enters the spino-thalamic tract

NEURON 2

Cell body in

dorsal root ganglion

2nd  synapse

(with neuron in the thalamus)

Thalamo-cortical tract

NEURON 3

3rd  synapse

(with cortical neuron)

Primary sensory neuron

NEURON 1

Sensory endings

Spinalnerve

Somatosensory cortex

Thalamus

Internal capsule

Lentiformnucleus

©KCL