L4 dorsal root ganglion morphology trait VT:0001019 Any measurable or observable characteristic related to the shape, structure, color, or pattern of the group of nerve cell bodies located on the dorsal spinal roots within the vertebral column at the level of the fourth lumbar vertebra. L4 ganglion morphology trait L4 sympathetic ganglia morphology trait L4 sympathetic ganglion morphology trait Trait.ontology L4 DRG morphology trait L4 dorsal root ganglia morphology trait lumbar dorsal root ganglion morphology trait