Tone is a normal state of balance in bodily tissue such as muscle and skin. In resting muscles, it is a state of partial contraction of a muscle to a pre-set length that serves to maintain posture, organ function, such as digestion, and reflexes. Generally speaking, a nerve from the spinal cord, spinal nerve, will grow from the spine to a muscle, it splits to form motor neurons, then contacts the muscle fiber at a point called the neuromuscular junction. This formation, in conjunction with all the nerve fibers one cell stimulates, is known as a motor neuron. They maintain tone through creating random, irregular contractions until a signal from the spine, in most cases, or the brainstem to maintain tone. When a muscle is to be used,
