PLATYBASIA AMYOTROPHIC LATERAL SCLEROSIS UPPER LIMB APPROXIMATE ENTROPY 3D SPINAL CORD FORCE VARIABILITY NUMERICAL METHODS PINCH MOVEMENT HAND MODEL STOCHASTIC DIFFERENTIAL EQUATIONS CHIARI EDUCATION NEURONAL NETWORK M-MAX BIOMECHANICS MOTOR NEURON RECRUITMENT CURVE HUMANS TONSILLAR HERNIATION CLIVUS LENGHT NEURAL DRIVE SURFACE ELECTROMYOGRAPHY MOTOR UNIT FORCE VARIBILITY SPINAL REFLEXES POSTURAL CONTROL MOTOR CONTROL