Axon
In early embryonic development the neural tube differentiates into immature neurons which migrate to a final location and an axon grows from each immature neuron in response to chemical stimuli. During the development of the CNS, axons grow from their tip via a growth cone which has a broad sheet-like extension called a lamellipodium. This enables axons to navigate through their environment so they can meet with other axonal synapses and form connections which will become the entire circuitry of the nervous system.