The point of contract between the nerve ending and muscle fiber is called a motor neuron?

The point of contact between a nerve ending and muscle fiber is called a neuromuscular junction, not a motor neuron. A motor neuron is a neuron that transmits signals from the central nervous system to the muscles, causing them to contract. The neuromuscular junction is the site where the axon of a motor neuron connects to a muscle fiber, allowing the electrical signal from the neuron to be transmitted to the muscle and cause it to contract.