NSCI 324 Lecture Notes - Lecture 4: Too Short, Electromyography, Muscle Fascicle
27 Feb 2017
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Document Summary
Motor system: muscle mechanics, limb mechanics, spinal cord and brainstem, cerebral cortex, cerebellum. Only way to influence the world (except sweating) They are equally important and intimately linked. Muscle and limb mechanics: motor units, muscle mechanics, limb mechanics, muscle anatomical action. Motor unit = 1 motoneuron (mn) + innervated muscle fibres. Different than central nervous system with synapses. Motorneurons for a muscle are organized into a column. Motorneurons create long columns in the spinal cord. Muscles that are most medial are most medial. Each red arrow denotes an action potential. Motor unit generates a single twitch for each action potential. Twitches sum together as firing rate of action potentials increases. Fused tetanic contraction when twitches fuse into a smooth force profile. Hu(cid:373)a(cid:374) (cid:373)otor u(cid:374)its do(cid:374)"t go this high. Slow has few muscle fibres, small force output, fatidue-resistant neuron size slow small few muscle fibres medium small force output moderate force fatigue can maintain force output to a point.
