The signal informs the spinal cord and brain about

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The signal informs the spinal cord and brain about the extent and rate of stretch. Proprioception is the collection of information about body movements and position. Two kinds of proprioceptors:
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Cell Type Location Source of Input to these Cells Fiber Type Action Produced Alpha motor neurons Ventral horns of spinal cord, some cranial nerve nuclei Motor cortex, brainstem, muscle spindles, spinal interneurons Action potentials in muscle fibers, leading to contraction Muscle spindles Lie parallel to muscle fibers within a muscle Respond to stretch of associated muscle fibers Ia sensory fibers Synapse with alpha motor neurons & spinal interneurons, allowing muscle contraction to adjust to muscle stretching Golgi tendon organs Junctions between muscles & tendons Respond to tension in muscle Ib sensory fibers Synapse with spinal interneurons, inhibiting
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Reflex Control of Movement Reflexes = involuntary, consistent, and automatic responses to stimuli Can be monosynaptic (e.g., patellar reflex) or polysynaptic (e.g., reciprocal inhibition or flexion reflex)
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