tissue norepinephrine amount forebrain norepinephrine amount The proportion, quantity or volume in the forebrain (part of the brain developed from the most rostral of the three primary vesicles of the embryonic neural tube from which the diencephalon and telencephalon are derived) of a catecholamine hormone that functions as a neurotransmitter and is the precursor to epinephrine. caripark Trait.ontology CMO:0003095 2019-10-30T14:34:32Z VT:0010859 brain norepinephrine amount