The area in question, the neurohypophysis, is an interface between nerve fibers and blood vessels located at the base of the brain.
From the sciencedaily.com
Since the human neurohypophysis is exceedingly complex, the scientists performed the research on live embryos of zebrafish.
From the sciencedaily.com
The scientists showed that oxytocin, one of the two major hormones secreted in the adult neurohypophysis, is involved in the development of this brain area already in the embryo.
From the sciencedaily.com
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Posterior pituitary: the posterior lobe of the pituitary body; primarily glandular in nature
Or posterior lobe of hypophysis - Greek hypo = down, and physis = growth; hence, the posterior part of the hypophysis evaginated downwards from the diencephalon, and its stalk.