pharmacological blockade of the biosynthesis of sertonin by repeated administration of para-chlorophenylalanine ( pcpa ) , or interruption ( by halasz knife ) of the serotoninergic pathways of the brain stem which terminate on hypothalamic nuclei equally resulted in an augmentation of the following parameters of hypothalamo-hypophysial-thyroid activity : t/s ratio , pituitary and blood tsh levels and blood thyroxine concentration as well as trh content of the hypothalamus .
C0032005
hypophysial
C0032002
pituitary