Figure 2. (a) The neurohypophysis is composed of “pituicytes”, modified glial cells, that surround axonal processes of neurons whose cell bodies are located in the hypothalamus. Occasional dilated terminals of those axons are seen as “Herring bodies” (arrows). (b) The neurohypophysis stores and releases the hypothalamic hormones oxytocin and vasopressin in Herring bodies that are best identified with immunostains for the hormones, as seen here stained for vasopressin (arrows).