So this is the axon of the motor neuron that's coming from the central nervous system and it basically splits in its synapses with our muscle cell. And at the given synapse we have the neuromuscular junction where our neurotransmitter acetylcholine basically transfers the action potential from the neuron to our muscle cell. So basically this muscle cell shown in red as well as the motor neuron is our motor unit. And in this particular case, the motor unit only consists of a single muscle cell and a single motor neuron. Now a single motor neuron always consists of a single neuron but it can have thousands of muscle cells. So we have thousands of these different types of muscle cells in a bundle and that is our motor neuron.