Resting membrane potential. Constant in time and space of the nerve fibers. Action potential and its propagation. Synapses. Neuromuscular Junction. Neuronal coding. Synaptic integration. sensory systems. Monosynaptic reflexes and plurisinaptic. tactile and kinesthetic sensibility. tactile receptors. Neuromuscular spindles :. Bodies muscle-Golgi tendon. thermal and pain sensitivity. vestibular apparatus. acoustic sensitivity, visual, olfactory and gustatory. motor control. The neuromotor units. Spinal reflexes. Maintaining posture. Motor coordination. afferent pathways, efferent. voluntary movement. cortical areas. pain sensitivity. trigeminal system. Nociception in the oral cavity.