Neuromuscular Junction

In this slide, note the single motor nerve branching off to innervate several skeletal muscle fibers. The axons terminate on the surface of the muscle fibers and form the motor end plate. The motor end plate is where neurotransmitter is released from the neuron to excite the muscle fiber. There is one motor endplate per muscle fiber. Recall that a motor unit is defined as a group of muscle fibers innervated by a single neuron.