tissue norepinephrine amount forebrain norepinephrine amount 2019-10-30T14:34:32Z CMO:0003095 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. Trait.ontology VT:0010859 caripark brain norepinephrine amount