on the other hand , the control of the ghrh secretion by peptidergic hypothalamic neurons occurs through four principal monoaminergic systems such as dopaminergic , noradrenergic , adrenergic and serotoninergic ones , and also by cholinergic fibers and by endogenous opiates , all acting to cause the release , into the hypothalamo-hypophyseal portal circulation , of ghrh .
C0020663
hypothalamic
C0037668
ghrh