Suprachiasmatic Nucleus

Definition

The suprachiasmatic nucleus (SCN) is a small group of cells located in the hypothalamus that plays a crucial role in regulating the sleep-wake cycle and circadian rhythms.

Related terms

Circadian Rhythms: These are internal biological rhythms that follow a 24-hour cycle, influencing various physical and behavioral processes.

Melatonin:

A hormone secreted by the pineal gland that helps regulate sleep by promoting drowsiness and maintaining circadian rhythm.

Retina:

The light-sensitive part of the eye that sends signals to the suprachiasmatic nucleus, helping it synchronize with environmental light-dark cycles.