How do the motor nerves work?

Your question is not very specific. I am going to answer for motor nerves at the lowest level of the motor system— but in great detail. What is written below for spinal motoneurons, also holds for above the neck muscles. read more

Within the vertebra, each nerve separates into dorsal roots (sensory nerve cell processes and cell bodies) and ventral roots (motor nerve cell processes). The autonomic nerve cell bodies lie along a chain that runs parallel with the spinal cord and inside the vertebrae, while their axons exit in the spinal nerve sheaths. read more

There are three types of motor nerves. Somatic motor nerves control skeletal muscles, which cause movement. Special visceral motor nerves control muscles in the face and neck. General visceral motor nerves control the smooth muscles that lack voluntary control, such as the heart. read more