Can a nerve impulses travel backwards?
Nope. However, there are nerves that travel in both directions. For example, if your finger touches a hot stove a nerve signal will transmit from your finger to the central nervous system through afferent nerves. Afferent nerves travel from the body parts to the central nervous system. The central nervous system will then send a signal through the efferrent nerves to the muscles out of your hand and arm telling them to pull away. Nerve impulses are prevented from traveling backwards at the synapses because there are no narrow transmitters released from the downstream nerve.
