Figure 33.5: Innervation of a Muscle Fiber In this view of several muscle fibers, we see a nerve cell process (axon) from a far-away nerve cell that controls the contraction of one of the muscle fibers. The point of contact of the nerve cell process with the muscle fiber is called a neuromuscular junction. When the nerve cell is stimulated, an impulse travels along its axon to the neuromuscular junction and excites the muscle fiber. It is possible for one nerve cell to send a process to more than one muscle fiber. In such cases, all the muscle fibers that the nerve cell innervates are simultaneously excited, and contract together, when the nerve cell is stimulated.