In vertebrates, motor neurons (also called motoneurons) are efferent neurons that originate in the spinal cord and synapse with muscle fibers to facilitate muscle contraction and with muscle ...

They happen when the muscle’s motor neuron—or messaging system responsible for moving a particular group of muscle fibers—randomly fires. The tips of motor neurons can be sensitive ...

Motor neurons project from the central nervous system to innervate muscle cells to either directly or indirectly control their activity. Contact between a motor neuron and muscle cell is usually ...

The scientists explained that motor units are composed of a single motor neuron and the muscle fibers that it can excite. Various motor units, activated in different combinations and sequences ...