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Nerve cells called motor neurons control the skeletal muscles. Each motor neuron controls several muscle cells in a group known as a motor unit. When a motor neuron receives a signal from the brain, it stimulates all of the muscles cells in its motor unit at the same time.
Motor neurons are among the largest neurons in the central nervous system and have long axons that travel along peripheral nerves to innervate skeletal muscles.otor neurons receive two types of synaptic inputs from descending pathways, spinal interneurons and segmental afferents: (1) excitatory and inhibitory inputs that directly affect membrane potential and (2) neuromodulatory inputs that alter the effects of the excitatory and inhibitory inputs on membrane potential.