normal motor neuron contract with muscle - 3d isometric view

motor myelin neurodegenerative nervous neuron muscle stiffness twitches weakness atrophy fasciculation wasting parkinson alzheimer dementia myasthenia gravis multiple sclerosis tendon reflex brain neurotransmitter dopamine neural axon serotonin stimulus neuropeptide telodendria hyponatremia calcium receptor adrenaline stroke tia hormone seizures mental synapse electron nerve signal mind neurology nucleus impulse electric epilepsy