![]() As this process involves depolarization (a change in the electrochemical gradient), the difference in current can be detected by EMG. This innervation causes the release of Calcium ions within the muscle, ultimately creating a mechanical change in the tension of the muscle. The lower motor neurons are the actual instigators of muscle movement, as they innervate the muscle directly at the neuromuscular junction. This begins with upper motor neurons, that carry the signal to lower motor neurons. Triggering muscle movements begins in the motor cortex, where neural activity (a series of action potentials) signals to the spinal cord, and the information about the movement is conveyed to the relevant muscle via motor neurons. The process of course begins in the brain. How to get started with EMG How do muscles move It is based on the simple fact that whenever a muscle contracts, a burst of electric activity is generated which propagates through adjacent tissue and bone and can be recorded from neighboring skin areas. EMG (electromyography) records the movement of our muscles. ![]()
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