The term dorsolateral part of the supraoptic nucleus refers to one of two parts of the supraoptic nucleus as demonstrated by Nissl stain in the human ( Mai-1997 ), macaque ( Paxinos-2009a ), rat ( Swanson-2004 ) and mouse ( Hof-2000 ). Also called 'supraoptic nucleus proper', it is located at the lateral boundary of the hypothalamus. It extends from the anterior hypothalamic region, where it lies dorsal to the optic chiasm, into the intermediate hypothalamic region, where it moves laterally to the dorsolateral surface of the optic tract. The other part is the retrochiasmatic part of the supraoptic nucleus. Functionally both belong to the subcortical motor system ( Swanson-2004 ).