nucleus

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Related to Raphe nuclei: Tuberomammillary nucleus, nucleus basalis of Meynert
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Evidence for a serotonergically mediated sympathoexcitatory response to stimulation of medullary raphe nuclei.
Raphe nuclei (see graphic): A moderate-sized group of nuclei (clusters of neurons) found in the brainstem that releases serotonin to the rest of the brain.
Serotonergic neurons from the dorsal and medial raphe nuclei project to hypothalamus, activating the hypothalamo-pituitary-adenocortical (HPA) and the hypothalamo-pituitary-gonadal (HPG) axes in the rat (Fuller 1996; Jorgensen et al.