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.
Motor neuron disease (MND) is a serious and incurable form of progressive neurodegeneration-over time the nerves in the spine and brain progressively lose function. In the case of motor neuron disease, motor neurons-types of nerve cells-are affected.The renowned English physicist, Stephen Hawking, and guitar virtuoso Jason Becker are living with motor neuron disease. In all three MND forms symptoms are very similar.However, they progress at different speeds.n the case of motor neuron disease, motor neurons-types of nerve cells-are affected. The renowned English physicist, Stephen Hawking, and guitar virtuoso Jason Becker are living with motor neuron disease.