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A motor neuron, sometimes combined into the singular term motoneuron, is a nerve cell. Its basic structure includes a receptor on one end and a transmitter on the other, connected by an elongated body called the axon, some of which can be 39 inches (1m) long in humans.
In order for skeletal muscle cells (muscle fibers) to contract, it is imperative they have communication with a motor neuron. A motor neuron is a nerve cell whose cell body is located in the spinal cord or brain. The axon of the nerve cell meanders toward the muscle it supplies. As it reaches the muscle, it branches: each branch going to a muscle fiber. The motor neuron, its axon branches, and all the muscle fibers it supplies is known as a motor unit and each muscle consists of numerous motor units (See Figure 1).