parasympathetic nervous system morphology trait parasympathetic ganglion morphology trait parasympathetic ganglia morphology trait Trait.ontology VT:0001034 Any measurable or observable characteristic related to the shape, structure, color, or pattern of the ganglia of the parasympathetic nervous system, including the ciliary, pterygopalatine, submandibular, and otic ganglia in the cranial region and intrinsic (terminal) ganglia associated with target organs in the thorax and abdomen.