Another Answer:
In the field of anatomy and physiology, motor nerves are the ones that transmit impulses, called action potentials, from the central nervous system (brain and spinal cord) to skeletal muscles. Sometimes motor nerves send messages that are voluntary or reflexive in order to make muscles contradict or inhibit muscle contraction.
Answer
A motor nerve is a kind of nerve that carries impulses from the central nervous system that trigger muscles to contract. It also allow to the brain to stimulate muscle contraction. Motor nerve is also called an efferent nerve that exclusively contains the axons of somatic and branchial motoneurons.