with the object of investigating the so called 'feedback ' mechanism , whereby hormones from the various endocrine glands influence the hypothalamus in its regulation of the hypophysial tropic hormones , the activity of the nucleus preopticus ( npo ) has been studied by means of karyometry under experimental conditions to understand the endocrine nature of the hypothalamic nuclei .
C0014133
endocrine glands
C0014136
endocrine