Parvocellular neurosecretory cell
Parvocellular neurosecretory cells are small neurons that produce hypothalamic releasing and inhibiting hormones. The cell bodies of these neurons are located in various nuclei of the hypothalamus or in closely related areas of the basal brain, mainly in the medial zone of the hypothalamus.
Source: Wikipedia — Parvocellular neurosecretory cell (CC BY-SA 4.0)