External motor neurons are specialized nerve cells that transmit signals from the central nervous system to muscles outside the brain and spinal cord. They play a crucial role in controlling voluntary movements, such as walking or grasping objects. These neurons are part of the peripheral nervous system, which connects the brain and spinal cord to the rest of the body. These neurons are responsible for activating muscle fibers, allowing for coordinated actions. When an external motor neuron sends a signal, it releases neurotransmitters at the neuromuscular junction, leading to muscle contraction. This process is essential for everyday activities and overall mobility.