the involution of the human nervous system with age results neuropathologically and clinically-neurologically in damage to the frontal lobe ( disinhibition of archaic reflexes ) , the extrapyramidal system ( parkinsonian walking pattern ) , the posterior tract of the spine ( unsteadiness of walking ) , and the peripheral nervous system ( e.g . loss of the achilles tendon reflex ) .
C0027763
nervous system
C0206417
peripheral nervous system