Piggins Hugh D, Loudon Andrew
Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK.
Curr Biol. 2005 Jun 21;15(12):R455-7. doi: 10.1016/j.cub.2005.06.019.
A small cluster of approximately 20,000 neurons in the ventral hypothalamus provide the body with key time-keeping signals and drive circadian rhythms. This circadian clock exhibits surprisingly complex substructures, with inputs from the retina, and outputs to other brain structures. Rather little is known of the neurotransmitters involved, or their regulation.
