For 10 points, name this portion of the brain linking the nervous system to the endocrine system and located above the brain stem and below the thalamus.
Its paraventricular nucleus contains magnocellular and parvocellular cells that project into the median eminence.  This organ's arcuate nucleus uses dopamine to suppress prolactin, which is unique since this organ normally has a stimulatory role, such as its release of GnRH leading to FSH and LH release. By communicating with the anterior pituitary gland, it is able to maintain homeostasis and metabolism by controlling body temperature, hunger, and thirst. For 10 points, name this portion of the brain linking the nervous system to the endocrine system and located above the brain stem and below the thalamus.
Its paraventricular nucleus contains magnocellular and parvocellular cells that project into the median eminence.  
hypothalamus