groups of neurons in the human brain which express its synthesizing enzyme, phenylethanolamine ''N''-methyltransferase; these neurons project from a nucleus that is adjacent (ventrolateral) to the area postrema and from a nucleus in the dorsal region of the solitary tract.

Biosynthesis

Dopamine is the first catecholamine synthesized from DOPA. In turn, norepinephrine and epinephrine are