neurosecretory substance

neu·ro·se·cre·to·ry sub·stance

the secretion of nerve cell bodies located in the hypothalamus; the substance is transported by way of hypothalamohypophysial tract fibers into the neurohypophysis where the terminals of the nerve fibers contain the secretion. As seen in the fibers and terminals with a light microscope, the substance appears as Herring bodies or hyaline bodies of the pituitary. See: hyaline bodies of pituitary.