This lesson is an introduction to how your brain “talks” to your muscles and instructs them to move. When your brain decides to move a muscle, neurons from an area of your brain (called motor cortex) travel through your spinal cord and connect with special cells called muscle fibers. With this experiment, you can learn about muscle physiology through electromyograms (EMGs). You will have an understanding of neuron/muscle communication, and you will listen to the electrical impulses of muscles at rest and during contraction.