sympathetic nervous system morphology trait thoracolumbar system morphology trait VT:0001007 Trait.ontology adrenergic system morphology trait somatic sympathetic system morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern of the part of the autonomic nervous system that innervates smooth muscle, cardiac muscle and glands and mediates the body's response to stressful situations. autonomic nervous system morphology trait