Number of HVCRA axons, average number of branches, percentage of the maximum number of branches, and median branch length as a function of branch order. A: The number of HVCRA axons as a function of highest branch order. B: The average number of branches per arbor as a function of branch order. C: The number of branches, expressed as a percentage of the maximum number of branches in each branch order, by branch order. D: Branch length (mm) of HVCRA axons by branch order.