arborise

verb3

1. •
   To develop a tree-like appearance.

   • The nerve fibre arborises into multiple branches.
2. •
   To cause (something) to develop a tree-like appearance.

   • His seven-year-old brain fires and rewires, building arborized axons, dendrites, those tiny spreading trees. — 2018
3. •
   To penetrate or fill (an area) with a tree-like structure.

   • The vessels penetrate the clavipectoral fascia […]. They then arborize the underside of the pectoralis major. — 1991