forelimb morphology trait carpus morphology trait carpal bone morphology trait wrist bone morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern of the nodular bones of the joint between the radius and ulna of the forelimb and the metacarpal bones. VT:0000554 Note that the bony structure of the human carpals are different. Trait.ontology skeleton extremities morphology trait