Normally, the coordinated action of the muscles of the stomach and small intestine propels the food from the stomach, through the small intestine and into the colon. This muscular action also sweeps bacteria out of the small intestine and limits the numbers of bacteria in the small intestine.
The term 'motor neuron' is usually restricted to the efferent neurons that actually innervate muscles (the lower motor neurons). A single motor neuron may innervate many muscle fibres and a muscle fibre can undergo many action potentials in the time taken for a single muscle twitch.
The main function of a motor neuron is to convey output signals to muscles for joint control.This involves 'upper motor neurons' in the brain relaying signals to 'lower motor neurons' in the spinal cord, which in turn relay signals to skeletal muscles for joint control.Lower motor neurons are also involved in sympathetic function, such as blood pressure regulation.his involves 'upper motor neurons' in the brain relaying signals to 'lower motor neurons' in the spinal cord, which in turn relay signals to skeletal muscles for joint control. Lower motor neurons are also involved in sympathetic function, such as blood pressure regulation.