Components of the
trigeminal system
| Spinal nucleus | ||
| Caudal nucleus Pain/temp/itch | ||
| Interpolar nucleus Pain/reflexes, etc, ??? | ||
| Oral nucleus Reflexes, etc, ??? | ||
| Main sensory nucleus Mechanosensation | ||
| Mesencephalic nucleus Jaw proprioception | ||
| Motor nucleus Jaw muscles | ||
Organization of the spinal
trigeminal nucleus:
caudal nucleus
| Separate components for pain and touch | ||
| Brain stem nuclei: | ||
| Caudal nucleus (pain) | ||
| Interpolar nucleus (caudal part for pain-mouth) | ||
| Oral nucleus (???) | ||
| Main sensory nucleus | ||
| 3 Separate thalamic pain nuclei & 1 for touch: | ||
| Pain (VPM, VMpo, MD) | ||
| Touch (VPM) | ||
| 3 Separate cortical representations: | ||
| Postcentral gyrus (localization) | ||
| Insular (important for pain) | ||
| Cingulate (emotions, esp. for pain) | ||
| Pain suppression system | ||
| PAG-->Raphe nuclei (5-HT)-->Caudal nucleus | ||