motor neuron. structure and anatomy of a efferent neuron.

neuron muscle structure nerve axon nervous system central vector healthy health medical science biology education myelin schwann dendrites synapse anatomy neuromuscular junction excitability contraction neurotransmitter electromyography brainstem reflex arc innervation disease disorders scientific receptor neurology body biological medicine hormone organism nucleus care detail emotion mental impulse cytology macro cell mitochondrion sheath node ranvier terminal multiple sclerosis dopamine antipsychotics neuroleptics tranquilizers motor neuron efferent close-up fiber motoneuron telodendria cell axons carry signals spinal cord muscles