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They carry nerve impulses from your sensory organs, like your eyes, to your brain, or your central nervous system (CNS). When your eyes see something shiny on the ground, your afferent nerves tell your brain what your eyes see.In contrast, efferent nerves carry nerve impulses from your brain to parts of your body. So, when you see something shiny on the ground, your brain tells you to pick it up and look at it.Efferent = Exiting, the nerves impulses are exiting your brain. Afferent = the opposite.hen your eyes see something shiny on the ground, your afferent nerves tell your brain what your eyes see. In contrast, efferent nerves carry nerve impulses from your brain to parts of your body.
It always takes two visceral efferent neurons to conduct an impulse from the spinal cord (or brain, in some cases) to a muscle or gland: 1  Visceral efferent 1 (also called the preganglionic neuron) is a multipolar neuron that begins in the gray matter of the spinal cord, which is where its cell body is located. This neuron leaves the cord through the ventral root of a spinal nerve, leaves the spinal nerve via a structure called the white ramus, then ends in an autonomic ganglion (either sympathetic or parasympathetic).