What is the junction where a motor neuron communicates with a skeletal muscle fiber?

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The main idea is the specialized chemical synapse between a motor neuron and a skeletal muscle fiber. This junction, the neuromuscular junction, is where communication happens: the motor neuron releases acetylcholine into the tiny gap (the synaptic cleft) and acetylcholine binds to receptors on the muscle’s motor end plate, triggering depolarization that leads to a muscle action potential and contraction. The motor end plate is the muscle-facing surface of this junction, while the synaptic cleft is just the space the neurotransmitter crosses. “Myoneural synapse” is an older term for the same structure, but the standard name for the site of communication is the neuromuscular junction.