nucleus accumbens morphology trait Nacc morphology trait accumbens nucleus morphology trait VT:0004080 Trait.ontology Any measurable or observable characteristic related to the shape, structure, color, or pattern of the group of neurons located at the head of the caudate nucleus and anterior to the putamen; these neurons normally are involved in sensations of pleasure and reactions to addictive substances. EFO:0006931 ventral striatum morphology trait limbic system morphology trait