Suprachiasmatic nucleus:

the suprachiasmatic nucleus is represented by the small green area within the hypothalamus (also indicated by the red arrow).

nucleus in hypothalamus that regulates circadian rhythms. It is responsible for ensuring that a number of bodily functions operate on a 24-hour cycle.

Watch this 2-Minute Neuroscience video to learn more about the suprachiasmatic nucleus.

Read more: Know your brain - Suprachiasmatic nucleus