parasympathetic nervous system morphology trait VT:0001033 somatic parasympathetic system morphology trait cholinergic system morphology trait Trait.ontology 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 regulates homeostasis. craniosacral system morphology trait autonomic nervous system morphology trait