spleen white pulp morphology trait spleen central arteriole morphology trait VT:0002361 Trait.ontology splenic central arteriole morphology trait CA morphology trait follicular arteriole morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern of the blood vessel surrounded by the periarteriolar lymphoid sheath that connects the trabecular artery to the trabecular vein. arteriole morphology trait