11_Unit2-2.6_MotorUnit copy

2 ratio principle muscle muscle consists of thousands

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Unformatted text preview: uscle. 2 ! ratio principle-- Muscle muscle •  Consists of thousands of muscle fibers working in parallel and organized into a smaller number of motor units fiber •  Principles of the Motor Unit Organization myofibril Ratio Principle Size Principle filaments fine vs gross-- few fibers per MU for fine (1:5) ex extra-ocular muscles many fibers per MU is gross MOTOR UNITS 1 neuron to between 5 and several thousand fibers Fine versus gross? Ratio Principle! Fine motor e.g., the extra-ocular muscles G...
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