Fig. 5.

For both supraorbital (SO) and supratrochlear (ST) nerves, average myelinated axon counts were greatest proximally. The most precipitous drop in axons occurred proximally, with a nearly 60% decrease in SO axon count by 3 cm distally. By 6 cm, average SO axon count was less than one third of that at the supraorbital rim. Throughout their courses, the SO nerves contained a greater number of axons than did ST nerves. The difference was largest proximally, with the SO nerve containing on average greater than double the number of axons of the ST nerve at the supraorbital rim