Intact peripheral target essential for branching of developing nerve fibers.
D000818:Animals; D001369:Axons / Q000648:ultrastructure; D002452:Cell Count; D004372:Ducks; D009132:Muscles / Q000294:innervation*; D009412:Nerve Fibers / Q000648:ultrastructure*; D009474:Neurons / Q000166:cytology; D009435:Synaptic Transmission; D014321:Trochlear Nerve / Q000196:embryology*