Axon vs Dendrite: Key Differences in Neuron Structure & Function
Axon: the neuron’s long, single output cable that shoots electrical impulses toward other cells. Dendrite: the tree-like input wires that receive those impulses and ferry them to the cell body.
People mix them up because “dendrite” sounds like “tree branch” and “axon” sounds clinical—so they assume both are just “nerve endings.” In reality, dendrites collect messages and axons deliver them, making the neuron a one-way street.
Key Differences
Axon: one per neuron, wrapped in myelin, can stretch over a meter, fires action potentials away from the soma. Dendrite: many per neuron, spiny, rarely myelinated, uses graded potentials toward the soma. Functionally, axons broadcast, dendrites listen.
Which One Should You Choose?
You don’t pick—your brain assigns roles. Axon length suits motor commands; dendrite branching fits sensory integration. In lab cultures, engineers grow axons for neural conduits and dendrite mats for sensor arrays.
Examples and Daily Life
Touch a hot pan: pain signals race up long axons to your spinal cord, then dendrites in the brain receive “pull away” commands. A stroke that severs axons stops outgoing orders; one that damages dendrites garbles incoming data.
Can a neuron have multiple axons?
Almost always just one; rare exceptions appear in specialized invertebrate neurons.