The principal (main) sensory nucleus of the trigeminal nerve lies in the mid pons beside the trigeminal motor nucleus. It receives fine touch and pressure from the face, mouth and teeth.
| Location | Lateral pontine tegmentum, at the level of trigeminal nerve entry |
|---|---|
| Parts |
|
| Connections | |
| Blood Supply | Basilar artery (pontine branches) |
Relays discriminative touch and pressure from the face to the thalamus and cortex.
Pontine strokes or multiple sclerosis can reduce facial touch sensation while pain and temperature (carried by the spinal trigeminal nucleus) may be spared, which helps localise lesions.
Loss of facial touch sense from damage near the principal sensory nucleus.
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