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.
Science Videos. Science Main Index. Motor nerves or motor neurons are a type of cell located in the central nervous system (CNS) that have axons extending outside the CNS to directly or indirectly control muscle contraction. Read on to learn more about motor neurons, and the role they play in your body.