The superior and inferior salivatory nuclei are groups of parasympathetic neurons in the brainstem that control saliva and tear production. The superior nucleus sends fibres through the facial nerve and the inferior through the glossopharyngeal nerve.
| Location | Superior nucleus in the lower pons; inferior nucleus in the upper medulla, both near the floor of the fourth ventricle |
|---|---|
| Parts |
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| Connections | |
| Blood Supply | Basilar artery and vertebral artery branches |
Control salivation and tear secretion in response to taste, smell and emotion.
Misdirected regrowth of fibres after facial nerve injury can cause tearing while eating ("crocodile tears"). After parotid surgery, salivary fibres can regrow into sweat glands, causing gustatory sweating (Frey syndrome).
Tearing during eating after facial nerve injury with aberrant regeneration.
Facial sweating and flushing while eating after parotid surgery.
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