these nerves , which originate in the mediobasal hypothalamus and terminate in the external layer of the median eminence , differ from other da nerves in the brain in that they : 1 ) lack a high affinity da uptake mechanism , 2 ) are not responsive to the acute administration of da agonists or antagonists , 3 ) are responsive to increased concentrations of prolactin in blood or cerebrospinal fluid .
C0006104
brain
C0086045
concentrations