In mammals, the suprachiasmatic nuclei located here allow it to function as a biological clock.  
In mammals, the suprachiasmatic nuclei located here allow it to function as a biological clock.  It  also receives input from the circumventricular organs, which monitor substances in the blood, and leptin, a hormone that increases metabolism, is believed to act on it. Besides the input it receives from these sensors and the limbic system, this area of the brain also possesses thermoreceptors and osmoreceptors, allowing it to maintain ionic balance and keep the body at a constant temperature. Operating by sending neural signals to the autonomic nervous system and endocrine signals to the pituitary, FTP, identify this region of the brain, so named because it lies beneath another brain area.
In mammals, the suprachiasmatic nuclei located here allow it to function as a biological clock.  
hypothalamus