Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Current working model of the hierarchical multi-oscillatory mammalian circadian system. Light (via the eye) entrains the SCN and non-photic inputs (e.g. food, palatable meal, wheel-running) entrain (via unknown pathways) extra-SCN pacemakers. The SCN and extra-SCN pacemakers coordinate the phases of peripheral oscillators. The output pathways that control overt rhythms of behavior and physiology are largely unknown. Dotted lines represent unknown pathways.
