NROC64H3 Lecture Notes - Lower Motor Neuron, Alpha Motor Neuron, Gamma Motor Neuron

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16 Mar 2012
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The motor system consists of all our muscles and neurons that control them; complex patterns of behaviour can be generated without the participation of the brain. Spinal cords command and control of co-ordinated muscle contraction. Brain"s command and control of motor programs in spinal cord. Cns axon branch muscle fiber skeletal muscle somatic motor system (voluntary control) Skeletal muscles e. g. move bones around joints, move eyes within head, respiration etc. Smooth digestive tract, arteries, structures innervated by nerve fibers in the autonomic nervous system. *important for peristalsis, control of blood pressure and blood flow. Major muscle that causes flexion brachialis, whose tendons insert into the humerus at one end and into the ulna at the other. Contraction of synergistic flexor muscles + relaxation of the antagonistic extensor muscles. Distal hands, feet, fingers (manipulation of small objects) Upper motor neurons of the brain supply input to the spinal cord.

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