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Unformatted text preview: Tension on muscle spindle Excitation of dorsal root ganglion neuron Excitatory synapse with alpha motor neuron Contraction o extrafusal fibers o Increased muscle tension Golgi tendon organ (GTO) system: an inhibitory pathway; a local negative feedback system Sequence: Contraction of extrafusal fibers Increased tension on GTO Excitation of DRG neuron Excitation of inhibitory interneuron Inhibition of alpha motor neurons Decreased muscle tension Babinski reflex: an abnormal response due to the blockage of cortical signals to spinal inhibitory neuron; dorsiflexion of the big toe in response to scratching the sole of the foot (weird); indicates lesion of the corticospinal tract...
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- Spring '11