Vesicles loaded with neurotransmitters travel from a neuron's cell body all the way down the axon to the terminal. Which structural elements serve as the tracks for this cargo movement?

Core Concept

Kinesin motors grip microtubules and step toward their plus ends while burning ATP, dragging vesicle cargo across long distances inside the cell. Axons rely on this microtubule-based system for delivery of membrane-bound material to the terminal. Without the tracks and their motors, vesicles would wander by diffusion and rarely reach their distant targets.