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Cluster Headaches and Circadian rhythms Circadian rhythms are regular changes in mental and physical characteristics that occur in the course of a day. Most circadian rhythms are controlled by a part of the brain called the suprachiasmatic nucleus or SCN, is actually a pair of pinhead-sized brain structures that together contain about 20,000 neurons. The tendency of Cluster Headaches suggests they could be caused by irregularities in the body’s circadian rhythms, which are controlled by the brain and a family of hormones that regulate the sleep-wake cycle. Hypothalamus Pituitary
Nucleus (SCN) Output Rhythms
Behavior Source: U.S. Department of Health and Human Services, National Institutes of Health, National Institute of Neurological Disorders and Stroke. www.ninds.nih.gov LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD