Signals from the retina reach the anterior hypothalamus
via the optic nerve, and the retinal axons terminate in the suprachiasmatic nuclei, which function as a biological clock or circadian pacemaker (J.
suprachiasmatic nucleus, or SCN, is an egg-shaped, densely packed collection of small cells of the anterior hypothalamus
situated close to the midline.
Lesions of the anterior hypothalamus
protected rats from the effects of experimental autoimmune encephalomyelitis (Abramsky, Wertman, Reches, Brenner, & Ovadia, 1987) and anterior lesions reduced the production of antibody to ovalbumin in rats (Tyrey & Nalbandov, 1972).
Heat and cold receptors convey information to the spinal cord, which passes it to the anterior hypothalamus
in the brain.
Although scientists have yet to identify the precise function of the clump, called the interstitial nuclei of the anterior hypothalamus
3 (INAH 3), the hypothalamus is known as the seat of the emotions and sexual drives.