* Neuromuscular junction is the site where motor axons terminate on individual muscle cells.
Axons from a single neuron innervate muscle cells throughout the muscle; any given muscle has multiple motor units.
The innervation ratio refers to the number of muscle cells a single motor neuron innervates; in general, the smaller this number, the finer the motor control.
Small innervation ratios produce fine motor control, such as for eye muscle control.
Whereas large innervation ratios produce gross motor control, such as for hamstring muscle knee flexion.