MeSH definition : Layer of gray matter in the hypothalamus that also forms part of the floor of the
third ventricle and merges anteriorly into the infundibulum (see PITUITARY GLAND,
POSTERIOR).;
Layer of gray matter in the hypothalamus that also forms part of the floor of the
third ventricle and merges anteriorly into the infundibulum (see PITUITARY GLAND,
POSTERIOR).