Tuberomammillary nucleus

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The tuberomammillary nucleus is a subnucleus of the posterior third of the hypothalamus. It consists of, largely, histaminergic (i.e., neurones releasing histamine) and is involved with the control of arousal, sleep and circadian rhythm.


see, for example Kandel, Schwartz & Jessel, Principles of Neural Science, 4th Ed., p977.