This is an accessible content page containing a Hot Spot Explore Activity. It has opened in a new window.
The activity has an image with defined hotspot areas. The hotspot areas in the image are labeled as:

Spinothalamic tract
Free nerve ending relaying pain
Dorsal root ganglion of primary sensory neuron
Nucleus proprius
Spinothalamic tract crossing in the anterior commissure of the cord
Spinothalamic tract proper
VPL(ventral posterior lateral nucleus of the thalamus)
Area 312 of the somatosensory cortex (post central gyrus)